wp-optimize / cache / file-based-page-cache-functions.php

file-based-page-cache-functions.php in WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 3.4.0, at cache/file-based-page-cache-functions.php

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1	<?php
2
3	if (!defined('ABSPATH')) die('No direct access allowed');
4
5	/**
6	* Extensions directory.
7	*/
8	if (!defined('WPO_CACHE_EXT_DIR')) define('WPO_CACHE_EXT_DIR', dirname(__FILE__).'/extensions');
9
10	/**
11	* Holds utility functions used by file based cache
12	*/
13
14	/**
15	* Cache output before it goes to the browser. If moving/renaming this function, then also change the check above.
16	*
17	* @param String $buffer Page HTML.
18	* @param Int $flags OB flags to be passed through.
19	*
20	* @return String
21	*/
22	if (!function_exists('wpo_cache')) :
23	function wpo_cache($buffer, $flags) {
24
25	// This case appears to happen for unclear reasons without WP being fully loaded, e.g. https://wordpress.org/support/topic/fatal-error-since-wp-5-8-update/ . It is simplest just to short-circuit it.
26	if ('' === $buffer) return '';
27
28	// This array records reasons why no caching took place. Be careful not to allow actions to proceed that should not - i.e. take note of its state appropriately.
29	$no_cache_because = array();
30
31	if (strlen($buffer) < 255) {
32	$no_cache_because[] = sprintf(__('Output is too small (less than %d bytes) to be worth caching', 'wp-optimize'), 255);
33	}
34
35	// Don't cache pages for logged in users.
36	if (!function_exists('is_user_logged_in') \|\| (function_exists('wp_get_current_user') && is_user_logged_in())) {
37	if (!wpo_cache_loggedin_users()) {
38	$no_cache_because[] = __('User is logged in', 'wp-optimize');
39	} elseif (!empty($GLOBALS['wpo_cache_config']['enable_user_caching'])) {
40	// Will only run when "Serve cached pages to logged in users" is checked
41	$no_cache_because[] = __('User is logged in, this works only when the cache is preloaded', 'wp-optimize');
42	}
43	}
44
45	$restricted_page_type_cache = apply_filters('wpo_restricted_cache_page_type', false);
46	if ($restricted_page_type_cache) {
47	$no_cache_because[] = $restricted_page_type_cache;
48	}
49
50	$conditional_tag_exceptions = apply_filters('wpo_url_in_conditional_tags_exceptions', false);
51	if ($conditional_tag_exceptions) {
52	$no_cache_because[] = $conditional_tag_exceptions;
53	}
54
55	// No root cache folder, so short-circuit here
56	if (!file_exists(WPO_CACHE_DIR)) {
57	$no_cache_because[] = __('WP-O cache parent directory was not found', 'wp-optimize').' ('.WPO_CACHE_DIR.')';
58	} elseif (!file_exists(WPO_CACHE_FILES_DIR)) {
59	// Try creating a folder for cached files, if it was flushed recently
60	if (!mkdir(WPO_CACHE_FILES_DIR)) {
61	$no_cache_because[] = __('WP-O cache directory was not found', 'wp-optimize').' ('.WPO_CACHE_FILES_DIR.')';
62	} else {
63	wpo_disable_cache_directories_viewing();
64	}
65	}
66
67	// If comments are opened and the user has saved his information.
68	if (function_exists('comments_open') && function_exists('get_post') && get_post() && comments_open()) {
69	$commenter = wp_get_current_commenter();
70	// if any of the fields contain something, do not save to cache
71	if ('' != $commenter['comment_author'] \|\| '' != $commenter['comment_author_email'] \|\| '' != $commenter['comment_author_url']) {
72	$no_cache_because[] = __('Comments are opened and the visitor saved his information.', 'wp-optimize');
73	}
74	}
75
76	$can_cache_page = true;
77
78	if (defined('DONOTCACHEPAGE') && DONOTCACHEPAGE) {
79	$can_cache_page = false;
80	}
81
82	/**
83	* Defines if the page can be cached or not
84	*
85	* @param boolean $can_cache_page
86	*/
87	$can_cache_page_filter = apply_filters('wpo_can_cache_page', $can_cache_page);
88
89	if (!$can_cache_page_filter) {
90	if ($can_cache_page) {
91	$can_cache_page = false;
92	$no_cache_because[] = __('wpo_can_cache_page filter forbade it', 'wp-optimize');
93	} else {
94	$no_cache_because[] = __('DONOTCACHEPAGE constant forbade it and wpo_can_cache_page filter did not over-ride it', 'wp-optimize');
95	}
96	}
97
98	if (defined('REST_REQUEST') && REST_REQUEST) {
99	$no_cache_because[] = __('This is a REST API request (identified by REST_REQUEST constant)', 'wp-optimize');
100	}
101
102	// Don't cache with fatal error pages.
103	$last_error = error_get_last();
104	if (is_array($last_error) && E_ERROR == $last_error['type']) {
105	$no_cache_because[] = __('This page has a fatal error', 'wp-optimize');
106	}
107
108	if (http_response_code() >= 500) {
109	$no_cache_because[] = sprintf(__('This page has a critical error (HTTP code %s)', 'wp-optimize'), http_response_code());
110	} elseif (http_response_code() >= 400) {
111	$no_cache_because[] = sprintf(__('This page returned an HTTP unauthorised response code (%s)', 'wp-optimize'), http_response_code());
112	}
113
114	if (empty($no_cache_because)) {
115
116	$buffer = apply_filters('wpo_pre_cache_buffer', $buffer, $flags);
117
118	$url_path = wpo_get_url_path();
119
120	$dirs = explode('/', $url_path);
121
122	$path = WPO_CACHE_FILES_DIR;
123
124	foreach ($dirs as $dir) {
125	if (!empty($dir)) {
126	$path .= '/' . $dir;
127
128	if (!file_exists($path)) {
129	if (!mkdir($path)) {
130	$no_cache_because[] = __('Attempt to create subfolder within cache directory failed', 'wp-optimize')." ($path)";
131	break;
132	}
133	}
134	}
135	}
136	}
137
138	if (!empty($no_cache_because)) {
139
140	$message = implode(', ', $no_cache_because);
141
142	// Add http headers
143	wpo_cache_add_nocache_http_header($message);
144
145	if ((!defined('DOING_CRON') \|\| !DOING_CRON) && (!defined('REST_REQUEST') \|\| !REST_REQUEST)) {
146	$not_cached_details = "";
147
148	// Output the reason only when the user has turned on debugging
149	if (((defined('WP_DEBUG') && WP_DEBUG) \|\| isset($_GET['wpo_cache_debug']))) {
150	$not_cached_details = "because: ".htmlspecialchars($message) . " ";
151	}
152
153	$buffer .= sprintf("\n<!-- WP Optimize page cache - https://getwpo.com - page NOT cached %s-->\n", $not_cached_details);
154	}
155
156	return $buffer;
157
158	} else {
159
160	// Prevent mixed content when there's an http request but the site URL uses https.
161	$home_url = get_home_url();
162
163	if (!is_ssl() && 'https' === strtolower(parse_url($home_url, PHP_URL_SCHEME))) {
164	$https_home_url = $home_url;
165	$http_home_url = str_ireplace('https://', 'http://', $https_home_url);
166	$buffer = str_replace(esc_url($http_home_url), esc_url($https_home_url), $buffer);
167	}
168
169	$modified_time = time(); // Take this as soon before writing as possible
170	$timezone_string = '';
171	$utc = isset($GLOBALS['wpo_cache_config']['gmt_offset']) ? (float) $GLOBALS['wpo_cache_config']['gmt_offset'] : 0;
172	$modified_time += $utc * 3600;
173
174	if (!empty($GLOBALS['wpo_cache_config']['timezone_string'])) {
175	$timezone_string = 'UTC' !== $GLOBALS['wpo_cache_config']['timezone_string'] ? $GLOBALS['wpo_cache_config']['timezone_string'] : '';
176	}
177
178	if (!empty($timezone_string)) {
179	$timezone_postfix = "(".$timezone_string." UTC:". $utc .")";
180	} else {
181	$timezone_postfix = "(UTC:" . $utc . ")";
182	}
183
184	$add_to_footer = '';
185
186	/**
187	* Filter whether to display the html comment <!-- Cached by WP-Optimize ... -->
188	*
189	* @param boolean $show - Whether to display the html comment
190	* @return boolean
191	*/
192	if (preg_match('#</html>#i', $buffer) && (apply_filters('wpo_cache_show_cached_by_comment', true) \|\| (defined('WP_DEBUG') && WP_DEBUG))) {
193	$date_time_format = 'F j, Y g:i a';
194	if (!empty($GLOBALS['wpo_cache_config']['date_format']) && !empty($GLOBALS['wpo_cache_config']['time_format'])) {
195	$date_time_format = $GLOBALS['wpo_cache_config']['date_format'] . ' ' . $GLOBALS['wpo_cache_config']['time_format'];
196	}
197
198	if (!empty($GLOBALS['wpo_cache_config']['enable_mobile_caching']) && wpo_is_mobile()) {
199	$add_to_footer .= "\n<!-- Cached by WP-Optimize - for mobile devices - https://getwpo.com - Last modified: " . gmdate($date_time_format, $modified_time) . " " . $timezone_postfix . " -->\n";
200	} else {
201	$add_to_footer .= "\n<!-- Cached by WP-Optimize - https://getwpo.com - Last modified: " . gmdate($date_time_format, $modified_time) . " " . $timezone_postfix . " -->\n";
202	}
203	}
204
205	// Create an empty index.php file in the cache directory for disable directory viewing.
206	if (!is_file($path . '/index.php')) file_put_contents($path . '/index.php', '');
207
208	/**
209	* Save $buffer into cache file.
210	*/
211	$file_ext = '.html';
212
213	if (wpo_feeds_caching_enabled()) {
214	if (is_feed()) {
215	$file_ext = '.rss-xml';
216	}
217	}
218
219	$cache_filename = wpo_cache_filename($file_ext);
220	$cache_file = $path . '/' .$cache_filename;
221
222	if (defined('WPO_CACHE_FILENAME_DEBUG') && WPO_CACHE_FILENAME_DEBUG) {
223	$add_to_footer .= "\n<!-- WP Optimize page cache debug information -->\n";
224	if (!empty($GLOBALS['wpo_cache_filename_debug']) && is_array($GLOBALS['wpo_cache_filename_debug'])) {
225	$add_to_footer .= "<!-- \n" . join("\n", array_map('htmlspecialchars', $GLOBALS['wpo_cache_filename_debug'])) . "\n --->";
226	}
227	}
228
229	// if we can then cache gzipped content in .gz file.
230	if (function_exists('gzencode') && apply_filters('wpo_allow_cache_gzip_files', true)) {
231	// Only replace inside the addition, not inside the main buffer (e.g. post content)
232	file_put_contents($cache_file . '.gz', gzencode($buffer.str_replace('by WP-Optimize', 'by WP-Optimize (gzip)', $add_to_footer), apply_filters('wpo_cache_gzip_level', 6)));
233	}
234
235	file_put_contents($cache_file, $buffer.$add_to_footer);
236
237	if (is_callable('WP_Optimize')) {
238	// delete cached information about cache size.
239	WP_Optimize()->get_page_cache()->delete_cache_size_information();
240	} else {
241	// If the shutdown occurs before plugins are loaded,
242	// then this will trigger a fatal error, so, we check first
243	if (!doing_action('shutdown')) {
244	error_log('[WPO_CACHE] WP_Optimize() is not callable.');
245	$message = 'Please report this to WP-O support: ';
246	if (function_exists('wp_debug_backtrace_summary')) {
247	$message .= wp_debug_backtrace_summary();
248	} else {
249	$message .= wpo_debug_backtrace_summary();
250	}
251	error_log($message);
252	}
253	}
254
255	header('Cache-Control: no-cache'); // Check back every time to see if re-download is necessary.
256	header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $modified_time) . ' GMT');
257	header('WPO-Cache-Status: saving to cache');
258
259	if (wpo_cache_can_output_gzip_content()) {
260
261	if (!wpo_cache_is_in_response_headers_list('Content-Encoding', 'gzip')) {
262	header('Content-Encoding: gzip');
263	}
264
265	// Disable php gzip to avoid double compression.
266	ini_set('zlib.output_compression', 'Off');
267
268	return ob_gzhandler($buffer, $flags);
269	} else {
270	return $buffer;
271	}
272	}
273	}
274	endif;
275
276	/**
277	* Load files for support plugins.
278	*/
279	if (!function_exists('wpo_cache_load_extensions')) :
280	function wpo_cache_load_extensions() {
281	$extensions = glob(WPO_CACHE_EXT_DIR . '/*.php');
282
283	// Add external extensions
284	if (defined('WPO_CACHE_CUSTOM_EXT_DIR') && is_dir(WPO_CACHE_CUSTOM_EXT_DIR)) {
285	$extensions = array_merge($extensions, glob(WPO_CACHE_CUSTOM_EXT_DIR . '/*.php'));
286	}
287
288	if (empty($extensions)) return;
289
290	foreach ($extensions as $extension) {
291	if (is_file($extension)) require_once $extension;
292	}
293	}
294	endif;
295
296	if (!function_exists('wpo_restricted_cache_page_type')) {
297	function wpo_restricted_cache_page_type($restricted) {
298	global $post;
299
300	// Don't cache search or password protected.
301	if ((function_exists('is_search') && is_search()) \|\| (function_exists('is_404') && is_404()) \|\| !empty($post->post_password)) {
302	$restricted = __('Page type is not cacheable (search, 404 or password-protected)', 'wp-optimize');
303	}
304
305	// Don't cache the front page if option is set.
306	if (in_array('/', wpo_get_url_exceptions()) && function_exists('is_front_page') && is_front_page()) {
307
308	$restricted = __('In the settings, caching is disabled for the front page', 'wp-optimize');
309	}
310
311	// Don't cache htacesss. Remember to properly escape any output to prevent injection.
312	if (strpos($_SERVER['REQUEST_URI'], '.htaccess') !== false) {
313	$restricted = 'The file path is unsuitable for caching ('.$_SERVER['REQUEST_URI'].')';
314	}
315
316	// Don't cache feeds.
317	if (function_exists('is_feed') && is_feed() && !wpo_feeds_caching_enabled()) {
318	$restricted = __('We don\'t cache RSS feeds', 'wp-optimize');
319	}
320
321	return $restricted;
322	}
323	}
324
325	/**
326	* Returns true if we need cache content for loggedin users.
327	*
328	* @return bool
329	*/
330	if (!function_exists('wpo_cache_loggedin_users')) :
331	function wpo_cache_loggedin_users() {
332	return !empty($GLOBALS['wpo_cache_config']['enable_user_caching']) \|\| !empty($GLOBALS['wpo_cache_config']['enable_user_specific_cache']) \|\| (function_exists('wpo_we_cache_per_role') && wpo_we_cache_per_role());
333	}
334	endif;
335
336	/**
337	* Get filename for store cache, depending on gzip, mobile and cookie settings.
338	*
339	* @param string $ext
340	* @return string
341	*/
342	if (!function_exists('wpo_cache_filename')) :
343	function wpo_cache_filename($ext = '.html') {
344
345	$wpo_cache_filename_debug = array();
346
347	$filename = 'index';
348
349	if (wpo_cache_mobile_caching_enabled() && wpo_is_mobile()) {
350	$filename = 'mobile.' . $filename;
351	}
352
353	if (wpo_webp_images_enabled() && !wpo_is_using_webp_images_redirection() && wpo_is_using_alter_html()) {
354	$filename = $filename . '.webp';
355	}
356
357	$cookies = wpo_cache_cookies();
358
359	$cache_key = '';
360
361	/**
362	* Add cookie values to filename if need.
363	* This section was inspired by things learned from WP-Rocket.
364	*/
365	if (!empty($cookies)) {
366	foreach ($cookies as $key => $cookie_name) {
367	if (is_array($cookie_name) && isset($_COOKIE[$key])) {
368	foreach ($cookie_name as $cookie_key) {
369	if (isset($_COOKIE[$key][$cookie_key]) && '' !== $_COOKIE[$key][$cookie_key]) {
370	$_cache_key = $cookie_key.'='.$_COOKIE[$key][$cookie_key];
371	$_cache_key = preg_replace('/[^a-z0-9_\-\=]/i', '-', $_cache_key);
372	$cache_key .= '-' . $_cache_key;
373	$wpo_cache_filename_debug[] = 'Cookie: name: ' . $key . '[' . $cookie_key . '], value: *** , cache_key:' . $_cache_key;
374	}
375	}
376	continue;
377	}
378
379	if (isset($_COOKIE[$cookie_name]) && '' !== $_COOKIE[$cookie_name]) {
380	$_cache_key = $cookie_name.'='.$_COOKIE[$cookie_name];
381	$_cache_key = preg_replace('/[^a-z0-9_\-\=]/i', '-', $_cache_key);
382	$cache_key .= '-' . $_cache_key;
383	$wpo_cache_filename_debug[] = 'Cookie: name: ' . $cookie_name . ', value: *** , cache_key:' . $_cache_key;
384	}
385	}
386	}
387
388	$query_variables = wpo_cache_query_variables();
389
390	/**
391	* Add GET variables to cache file name if need.
392	*/
393	if (!empty($query_variables)) {
394	foreach ($query_variables as $variable) {
395	if (isset($_GET[$variable]) && !empty($_GET[$variable])) {
396	$_cache_key = $variable.'='.$_GET[$variable];
397	$_cache_key = preg_replace('/[^a-z0-9_\-\=]/i', '-', $_cache_key);
398	$cache_key .= '-' . $_cache_key;
399	$wpo_cache_filename_debug[] = 'GET parameter: name: ' . $variable . ', value:' . htmlentities($_GET[$variable]) . ', cache_key:' . $_cache_key;
400	}
401	}
402	}
403
404	// Adding cache key with queried cookies and variables to the cache file name.
405	if ('' !== $cache_key) {
406	// Add human-readable cache key to the filename
407	$filename .= str_replace('--', '-', '-'.$cache_key);
408	}
409
410	$filename = apply_filters('wpo_cache_filename', $filename);
411
412	// Trimming filename if it exceeds 240 characters due to filesystem limitations
413	if (strlen($filename) > 240) {
414	$filename = substr($filename, 0, 199) . '-' . sha1($filename);
415	}
416
417	$wpo_cache_filename_debug[] = 'Extension: ' . $ext;
418	$wpo_cache_filename_debug[] = 'Filename: ' . $filename.$ext;
419
420	$GLOBALS['wpo_cache_filename_debug'] = $wpo_cache_filename_debug;
421
422	return $filename . $ext;
423	}
424	endif;
425
426	/**
427	* Returns site url from site_url() function or if it is not available from cache configuration.
428	*/
429	if (!function_exists('wpo_site_url')) :
430	function wpo_site_url() {
431	if (is_callable('site_url')) return site_url('/');
432
433	$site_url = empty($GLOBALS['wpo_cache_config']['site_url']) ? '' : $GLOBALS['wpo_cache_config']['site_url'];
434	return $site_url;
435	}
436	endif;
437
438	/**
439	* Get cookie names which impact on cache file name.
440	*
441	* @return array
442	*/
443	if (!function_exists('wpo_cache_cookies')) :
444	function wpo_cache_cookies() {
445	$cookies = empty($GLOBALS['wpo_cache_config']['wpo_cache_cookies']) ? array() : $GLOBALS['wpo_cache_config']['wpo_cache_cookies'];
446	return $cookies;
447	}
448	endif;
449
450	/**
451	* Get GET variable names which impact on cache file name.
452	*
453	* @return array
454	*/
455	if (!function_exists('wpo_cache_query_variables')) :
456	function wpo_cache_query_variables() {
457	if (defined('WPO_CACHE_URL_PARAMS') && WPO_CACHE_URL_PARAMS) {
458	$variables = array_keys($_GET);
459	} else {
460	$variables = empty($GLOBALS['wpo_cache_config']['wpo_cache_query_variables']) ? array() : $GLOBALS['wpo_cache_config']['wpo_cache_query_variables'];
461	}
462
463	if (!empty($variables)) {
464	sort($variables);
465	}
466
467	return wpo_cache_maybe_ignore_query_variables($variables);
468	}
469	endif;
470
471	/**
472	* Get list of all received HTTP headers.
473	*
474	* @return array
475	*/
476	if (!function_exists('wpo_get_http_headers')) :
477	function wpo_get_http_headers() {
478
479	static $headers;
480
481	if (!empty($headers)) return $headers;
482
483	$headers = array();
484
485	// if is apache server then use get allheaders() function.
486	if (function_exists('getallheaders')) {
487	$headers = getallheaders();
488	} else {
489	// https://www.php.net/manual/en/function.getallheaders.php
490	foreach ($_SERVER as $key => $value) {
491
492	$key = strtolower($key);
493
494	if ('HTTP_' == substr($key, 0, 5)) {
495	$headers[str_replace(' ', '-', ucwords(str_replace('_', ' ', substr($key, 5))))] = $value;
496	} elseif ('content_type' == $key) {
497	$headers["Content-Type"] = $value;
498	} elseif ('content_length' == $key) {
499	$headers["Content-Length"] = $value;
500	}
501	}
502	}
503
504	return $headers;
505	}
506	endif;
507
508	/**
509	* Check if requested Accept-Encoding headers has gzip value.
510	*
511	* @return bool
512	*/
513	if (!function_exists('wpo_cache_gzip_accepted')) :
514	function wpo_cache_gzip_accepted() {
515	$headers = wpo_get_http_headers();
516
517	if (isset($headers['Accept-Encoding']) && preg_match('/gzip/i', $headers['Accept-Encoding'])) return true;
518
519	return false;
520	}
521	endif;
522
523	/**
524	* Check if we can output gzip content in current answer, i.e. check Accept-Encoding headers has gzip value
525	* and function ob_gzhandler is available.
526	*
527	* @return bool
528	*/
529	if (!function_exists('wpo_cache_can_output_gzip_content')) :
530	function wpo_cache_can_output_gzip_content() {
531	return wpo_cache_gzip_accepted() && function_exists('ob_gzhandler');
532	}
533	endif;
534
535	/**
536	* Check if header with certain name exists in already prepared headers and has value comparable with $header_value.
537	*
538	* @param string $header_name header name
539	* @param string $header_value header value as regexp.
540	*
541	* @return bool
542	*/
543	if (!function_exists('wpo_cache_is_in_response_headers_list')) :
544	function wpo_cache_is_in_response_headers_list($header_name, $header_value) {
545	$headers_list = headers_list();
546
547	if (!empty($headers_list)) {
548	$header_name = strtolower($header_name);
549
550	foreach ($headers_list as $value) {
551	$value = explode(':', $value);
552
553	if (strtolower($value[0]) == $header_name) {
554	if (preg_match('/'.$header_value.'/', $value[1])) {
555	return true;
556	} else {
557	return false;
558	}
559	}
560	}
561	}
562
563	return false;
564	}
565	endif;
566
567	/**
568	* Check if mobile cache is enabled and current request is from moblile device.
569	*
570	* @return bool
571	*/
572	if (!function_exists('wpo_cache_mobile_caching_enabled')) :
573	function wpo_cache_mobile_caching_enabled() {
574	if (!empty($GLOBALS['wpo_cache_config']['enable_mobile_caching'])) return true;
575	return false;
576	}
577	endif;
578
579	/**
580	* Check if webp images enabled
581	*
582	* @return bool
583	*/
584	if (!function_exists('wpo_webp_images_enabled')) :
585	function wpo_webp_images_enabled() {
586	if (!empty($GLOBALS['wpo_cache_config']['use_webp_images'])) return true;
587	return false;
588	}
589	endif;
590
591	/**
592	* Check whether webp images using alter html method or not
593	*
594	* @return bool
595	*/
596	if (!function_exists('wpo_is_using_alter_html')) :
597	function wpo_is_using_alter_html() {
598	return (isset($_SERVER['HTTP_ACCEPT']) && false !== strpos($_SERVER['HTTP_ACCEPT'], 'image/webp'));
599	}
600	endif;
601
602	/**
603	* Check whether webp images are served using redirect
604	*
605	* @return bool
606	*/
607	if (!function_exists('wpo_is_using_webp_images_redirection')) :
608	function wpo_is_using_webp_images_redirection() {
609	if (empty($GLOBALS['wpo_cache_config']['uploads'])) return false;
610
611	$uploads_dir = $GLOBALS['wpo_cache_config']['uploads'];
612	$htaccess_file = $uploads_dir . '/.htaccess';
613	if (!file_exists($htaccess_file)) return false;
614	$htaccess_content = file_get_contents($htaccess_file);
615	$comment_sections = array('Register webp mime type', 'WP-Optimize WebP Rules');
616
617	if (function_exists('str_contains')) {
618	return str_contains($htaccess_content, $comment_sections[0]) && str_contains($htaccess_content, $comment_sections[1]);
619	} else {
620	return strpos($htaccess_content, $comment_sections[0]) && strpos($htaccess_content, $comment_sections[1]);
621	}
622	}
623	endif;
624
625	/**
626	* Verify if the current request is related to the Activity Stream
627	*
628	* @return bool
629	*/
630	if (!function_exists('wpo_is_activity_stream_requested')) :
631	function wpo_is_activity_stream_requested() {
632	return (isset($_SERVER['HTTP_ACCEPT']) && false !== strpos($_SERVER['HTTP_ACCEPT'], 'application/activity+json'));
633	}
634	endif;
635
636	/**
637	* Verify if the current request is robots.txt
638	*/
639	if (!function_exists('wpo_is_robots_txt_requested')) :
640	function wpo_is_robots_txt_requested() {
641	return (isset($_SERVER['REQUEST_URI']) && 'robots.txt' === basename($_SERVER['REQUEST_URI']));
642	}
643	endif;
644
645	/**
646	* Serves the cache and exits
647	*/
648	if (!function_exists('wpo_serve_cache')) :
649	function wpo_serve_cache() {
650	$file_name = wpo_cache_filename();
651
652	$file_name_rss_xml = wpo_cache_filename('.rss-xml');
653	$send_as_feed = false;
654
655	$path_dir = WPO_CACHE_FILES_DIR . '/' . wpo_get_url_path() . '/';
656	$path = $path_dir . $file_name;
657
658	if (wpo_feeds_caching_enabled()) {
659	// check for .xml cache file if .html cache file doesn't exist
660	if (!file_exists($path_dir . $file_name) && file_exists($path_dir . $file_name_rss_xml)) {
661	$path = $path_dir . $file_name_rss_xml;
662	$send_as_feed = true;
663	}
664	}
665
666	$use_gzip = false;
667
668	// if we can use gzip and gzipped file exist in cache we use it.
669	// if headers already sent we don't use gzipped file content.
670	if (!headers_sent() && wpo_cache_gzip_accepted() && file_exists($path . '.gz')) {
671	$path .= '.gz';
672	$use_gzip = true;
673	}
674
675	$modified_time = file_exists($path) ? (int) filemtime($path) : time();
676
677	// Cache has expired, purge and exit.
678	if (!empty($GLOBALS['wpo_cache_config']['page_cache_length'])) {
679	if (time() > ($GLOBALS['wpo_cache_config']['page_cache_length'] + $modified_time)) {
680	wpo_delete_files($path);
681	return;
682	}
683	}
684
685	if ($use_gzip) {
686	// Disable zlib output compression to avoid double content compression
687	ini_set('zlib.output_compression', 'Off');
688	}
689
690	$gzip_header_already_sent = wpo_cache_is_in_response_headers_list('Content-Encoding', 'gzip');
691
692	header('Cache-Control: no-cache'); // Check back later
693
694	if (!empty($modified_time) && !empty($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) === $modified_time) {
695	if ($use_gzip && !$gzip_header_already_sent) {
696	header('Content-Encoding: gzip');
697	}
698
699	if ($send_as_feed) {
700	header('Content-type: application/rss+xml');
701	}
702
703	header('WPO-Cache-Status: cached');
704	header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $modified_time) . ' GMT');
705	header($_SERVER['SERVER_PROTOCOL'] . ' 304 Not Modified', true, 304);
706	exit;
707	}
708
709	if (file_exists($path) && is_readable($path)) {
710
711	if (wpo_is_canonical_redirection_needed()) return;
712
713	if ($use_gzip && !$gzip_header_already_sent) {
714	header('Content-Encoding: gzip');
715	}
716
717	// send correct headers for xml and txt files
718	$filename = basename(dirname($path));
719
720	if (preg_match('/\.xml$/i', $filename)) {
721	header('Content-type: text/xml');
722	}
723
724	if (preg_match('/\.txt$/i', $filename)) {
725	header('Content-type: text/plain');
726	}
727
728	if ($send_as_feed) {
729	header('Content-type: application/rss+xml');
730	}
731
732	header('WPO-Cache-Status: cached');
733	if (!empty($modified_time)) {
734	header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $modified_time) . ' GMT');
735	}
736
737	readfile($path);
738
739	exit;
740	}
741	}
742	endif;
743
744	/**
745	* Checks and does redirection, if needed
746	*
747	* @return bool
748	*/
749	if (!function_exists('wpo_is_canonical_redirection_needed')) :
750	function wpo_is_canonical_redirection_needed() {
751	$permalink_structure = isset($GLOBALS['wpo_cache_config']['permalink_structure']) ? $GLOBALS['wpo_cache_config']['permalink_structure'] : '';
752	$site_url = wpo_site_url();
753
754	// Exit if server variables are not available.
755	if (!isset($_SERVER['HTTP_HOST'])) return false;
756
757	$schema = isset($_SERVER['HTTPS']) && 'on' === $_SERVER['HTTPS'] ? "https" : "http";
758	$url_part = "://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
759	$requested_url = $schema . $url_part;
760	$url_parts = parse_url($requested_url);
761	$extension = pathinfo($url_parts['path'], PATHINFO_EXTENSION);
762
763	if (!empty($permalink_structure) && $requested_url != $site_url && ((isset($url_parts['path']) && '/' !== $url_parts['path']) \|\| isset($url_parts['query']))) {
764	$request_uri = rtrim($_SERVER['REQUEST_URI'], '?');
765	if ('/' == substr($permalink_structure, -1) && empty($extension) && empty($url_parts['query']) && empty($url_parts['fragment'])) {
766	$url = preg_replace('/(.+?)([\/]*)(\[\?\#][^\/]+\|$)/', '$1/$3', $request_uri);
767	if (0 !== strcmp($request_uri, $url)) return true;
768	} else {
769	$url = rtrim($request_uri, '/');
770	if (0 !== strcmp($request_uri, $url)) return true;
771	}
772	}
773	return false;
774	}
775	endif;
776
777	/**
778	* Clears the cache
779	*/
780	if (!function_exists('wpo_cache_flush')) :
781	function wpo_cache_flush() {
782
783	if (defined('WPO_CACHE_FILES_DIR') && '' != WPO_CACHE_FILES_DIR) wpo_delete_files(WPO_CACHE_FILES_DIR);
784
785	if (function_exists('wp_cache_flush')) {
786	wp_cache_flush();
787	}
788
789	do_action('wpo_cache_flush');
790	}
791	endif;
792
793	/**
794	* Get URL path for caching
795	*
796	* @since 1.0
797	* @return string
798	*/
799	if (!function_exists('wpo_get_url_path')) :
800	function wpo_get_url_path($url = '') {
801	$url = '' == $url ? wpo_current_url() : $url;
802	$url_parts = parse_url($url);
803
804	if (isset($url_parts['path']) && false !== stripos($url_parts['path'], '/index.php')) {
805	$url_parts['path'] = preg_replace('/(.*?)index\.php(\/.+)/i', '$1index-php$2', $url_parts['path']);
806	}
807
808	/*
809	* Convert the hexadecimal digits within the percent-encoded triplet to uppercase, to ensure that the path remains
810	* consistent. For instance, "example.com/%e0%a6" will be converted to "example.com/%E0%A6".
811	*/
812	if (isset($url_parts['path'])) {
813	$url_parts['path'] = preg_replace_callback('/%[0-9A-F]{2}/i', function($matches) {
814	return strtoupper($matches[0]);
815	}, $url_parts['path']);
816	}
817
818	if (!isset($url_parts['host'])) $url_parts['host'] = '';
819	if (!isset($url_parts['path'])) $url_parts['path'] = '';
820
821	return $url_parts['host'].$url_parts['path'];
822	}
823	endif;
824
825	/**
826	* Get requested url.
827	*
828	* @return string
829	*/
830	if (!function_exists('wpo_current_url')) :
831	function wpo_current_url() {
832	// Note: We use `static $url` to save the first value we retrieve, as some plugins change $_SERVER later on in the process (e.g. Weglot).
833	// Otherwise this function would return a different URL at the beginning and end of the cache process.
834	static $url = '';
835	if ('' != $url) return $url;
836	$http_host = isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST'] : '';
837	$url = rtrim('http' . ((isset($_SERVER['HTTPS']) && ('on' == $_SERVER['HTTPS'] \|\| 1 == $_SERVER['HTTPS']) \|\|
838	isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && 'https' == $_SERVER['HTTP_X_FORWARDED_PROTO']) ? 's' : '' )
839	. '://' . $http_host.$_SERVER['REQUEST_URI'], '/');
840	return $url;
841	}
842	endif;
843
844	/**
845	* Return list of conditional tag exceptions.
846	*
847	* @return array
848	*/
849	if (!function_exists('wpo_get_conditional_tags_exceptions')) :
850	function wpo_get_conditional_tags_exceptions() {
851	static $exceptions = null;
852
853	if (null !== $exceptions) return $exceptions;
854
855	if (!empty($GLOBALS['wpo_cache_config'])) {
856	if (empty($GLOBALS['wpo_cache_config']['cache_exception_conditional_tags'])) {
857	$exceptions = array();
858
859	} else {
860
861	$exceptions = $GLOBALS['wpo_cache_config']['cache_exception_conditional_tags'];
862
863	}
864
865	} elseif (class_exists('WPO_Page_Cache')) {
866
867	$config = WPO_Page_Cache::instance()->config->get();
868
869	if (is_array($config) && array_key_exists('cache_exception_conditional_tags', $config)) {
870	$exceptions = $config['cache_exception_conditional_tags'];
871	} else {
872	$exceptions = array();
873	}
874
875	$exceptions = is_array($exceptions) ? $exceptions : preg_split('#(\n\|\r\|\r\n)#', $exceptions);
876	$exceptions = array_filter($exceptions, 'trim');
877
878	} else {
879	$exceptions = array();
880	}
881
882	return $exceptions;
883	}
884	endif;
885
886	/**
887	* Return list of url exceptions.
888	*
889	* @return array
890	*/
891	if (!function_exists('wpo_get_url_exceptions')) :
892	function wpo_get_url_exceptions() {
893	static $exceptions = null;
894
895	if (null !== $exceptions) return $exceptions;
896
897	// if called from file-based-page-cache.php when WP loading
898	// and cache settings exists then use it otherwise get settings from database.
899	if (!empty($GLOBALS['wpo_cache_config'])) {
900	if (empty($GLOBALS['wpo_cache_config']['cache_exception_urls'])) {
901	$exceptions = array();
902	} else {
903	$exceptions = is_array($GLOBALS['wpo_cache_config']['cache_exception_urls']) ? $GLOBALS['wpo_cache_config']['cache_exception_urls'] : preg_split('#(\n\|\r)#', $GLOBALS['wpo_cache_config']['cache_exception_urls']);
904	}
905	} elseif (class_exists('WPO_Page_Cache')) {
906	$config = WPO_Page_Cache::instance()->config->get();
907
908	if (is_array($config) && array_key_exists('cache_exception_urls', $config)) {
909	$exceptions = $config['cache_exception_urls'];
910	} else {
911	$exceptions = array();
912	}
913
914	$exceptions = is_array($exceptions) ? $exceptions : preg_split('#(\n\|\r)#', $exceptions);
915	$exceptions = array_filter($exceptions, 'trim');
916	} else {
917	$exceptions = array();
918	}
919
920	return apply_filters('wpo_get_url_exceptions', $exceptions);
921	}
922	endif;
923
924	/**
925	* Return true of exception url matches current url
926	*
927	* @param string $exception Exceptions to check URL against.
928	* @param bool $regex Whether to check with regex or not.
929	* @return bool true if matched, false otherwise
930	*/
931	if (!function_exists('wpo_current_url_exception_match')) :
932	function wpo_current_url_exception_match($exception) {
933
934	return wpo_url_exception_match(wpo_current_url(), $exception);
935	}
936	endif;
937
938	/**
939	* Check if url in conditional tags exceptions list.
940	*
941	* @return string
942	*/
943	if (!function_exists('wpo_url_in_conditional_tags_exceptions')) :
944	function wpo_url_in_conditional_tags_exceptions() {
945
946	$exceptions = wpo_get_conditional_tags_exceptions();
947	$restricted = '';
948	$allowed_functions = array('is_single', 'is_page', 'is_front_page', 'is_home', 'is_archive', 'is_tag', 'is_category', 'is_feed', 'is_search', 'is_author', 'is_woocommerce', 'is_shop', 'is_product', 'is_account_page', 'is_product_category', 'is_product_tag', 'is_wc_endpoint_url', 'is_bbpress', 'bbp_is_forum_archive', 'bbp_is_topic_archive', 'bbp_is_topic_tag', 'bbp_is_single_forum', 'bbp_is_single_topic', 'bbp_is_single_view', 'bbp_is_single_user', 'bbp_is_user_home', 'bbp_is_search');
949	//Filter for add more conditional tags to whitelist in the exceptions list.
950	$allowed_functions = apply_filters('wpo_allowed_conditional_tags_exceptions', $allowed_functions);
951	if (!empty($exceptions)) {
952	foreach ($exceptions as $exception) {
953	if (false !== strpos($exception, 'is_')) {
954	$exception_function = $exception;
955	if ('()' == substr($exception, -2)) {
956	$exception_function = substr($exception, 0, -2);
957	}
958
959	if (in_array($exception_function, $allowed_functions) && function_exists($exception_function) && call_user_func($exception_function)) {
960	$restricted = sprintf(__('In the settings, caching is disabled for %s', 'wp-optimize'), $exception_function);
961	}
962	}
963	}
964	}
965	return $restricted;
966	}
967	endif;
968
969
970	/**
971	* Check if url in exceptions list.
972	*
973	* @param string $url
974	*
975	* @return bool
976	*/
977	if (!function_exists('wpo_url_in_exceptions')) :
978	function wpo_url_in_exceptions($url) {
979	$exceptions = wpo_get_url_exceptions();
980
981	if (!empty($exceptions)) {
982	foreach ($exceptions as $exception) {
983
984	// don't check / - front page using regexp, we handle it in wpo_restricted_cache_page_type()
985	if ('/' == $exception) continue;
986
987	if (wpo_url_exception_match($url, $exception)) {
988	// Exception match.
989	return true;
990	}
991	}
992	}
993
994	return false;
995	}
996	endif;
997
998	/**
999	* Checks if an URL matches against listed exceptions.
1000	*
1001	* @param string $url - complete url string i.e. http(s)://domain/path
1002	* @param string $exception - complete url or absolute path, can contain (.*) wildcards; Sometimes can be urlencoded
1003	*
1004	* @return bool
1005	*/
1006	if (!function_exists('wpo_url_exception_match')) :
1007	function wpo_url_exception_match($url, $exception) {
1008	if (preg_match('#^[\s]*$#', $exception)) {
1009	return false;
1010	}
1011
1012	$exception = str_replace('', '.', $exception);
1013
1014	$exception = trim($exception);
1015
1016	// Used to test websites placed in subdirectories.
1017	$sub_dir = '';
1018
1019	// If exception defined from root i.e. /page1 then remove domain part in url.
1020	if (preg_match('/^\//', $exception)) {
1021	// get site sub directory.
1022	$sub_dir = preg_replace('#^(http\|https):\/\/.*\/#Ui', '', wpo_site_url());
1023	// add prefix slash and remove slash.
1024	$sub_dir = ('' == $sub_dir) ? '' : '/' . rtrim($sub_dir, '/');
1025	// get relative path
1026	$url = preg_replace('#^(http\|https):\/\/.*\/#Ui', '/', $url);
1027	}
1028
1029	$url = urldecode(rtrim($url, '/')) . '/';
1030	$exception = rtrim($exception, '/');
1031
1032	// if we have no wildcard in the end of exception then add slash.
1033	if (!preg_match('#$\.\*$$#', $exception)) $exception .= '/';
1034
1035	$exception = preg_quote($exception);
1036
1037	// fix - unescape some possibly escaped mask characters
1038	$search = array(
1039	'\\.\\*',
1040	'\\-',
1041	);
1042	$replace = array(
1043	'.*',
1044	'-',
1045	);
1046	$exception = urldecode(str_replace($search, $replace, $exception));
1047
1048	return (preg_match('#^'.$exception.'$#i', $url) \|\| preg_match('#^'.$sub_dir.$exception.'$#i', $url));
1049	}
1050	endif;
1051
1052	/**
1053	* Checks if its a mobile device
1054	*
1055	* @see https://developer.wordpress.org/reference/functions/wp_is_mobile/
1056	*/
1057	if (!function_exists('wpo_is_mobile')) :
1058	function wpo_is_mobile() {
1059	if (empty($_SERVER['HTTP_USER_AGENT'])) {
1060	$is_mobile = false;
1061	// many mobile devices (all iPhone, iPad, etc.)
1062	} elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Mobile') !== false
1063	\|\| strpos($_SERVER['HTTP_USER_AGENT'], 'Android') !== false
1064	\|\| strpos($_SERVER['HTTP_USER_AGENT'], 'Silk/') !== false
1065	\|\| strpos($_SERVER['HTTP_USER_AGENT'], 'Kindle') !== false
1066	\|\| strpos($_SERVER['HTTP_USER_AGENT'], 'BlackBerry') !== false
1067	\|\| strpos($_SERVER['HTTP_USER_AGENT'], 'Opera Mini') !== false
1068	\|\| strpos($_SERVER['HTTP_USER_AGENT'], 'Opera Mobi') !== false
1069	) {
1070	$is_mobile = true;
1071	} else {
1072	$is_mobile = false;
1073	}
1074
1075	return $is_mobile;
1076	}
1077	endif;
1078
1079	/**
1080	* Check if current browser agent is not disabled in options.
1081	*
1082	* @return bool
1083	*/
1084	if (!function_exists('wpo_is_accepted_user_agent')) :
1085	function wpo_is_accepted_user_agent($user_agent) {
1086
1087	$exceptions = is_array($GLOBALS['wpo_cache_config']['cache_exception_browser_agents']) ? $GLOBALS['wpo_cache_config']['cache_exception_browser_agents'] : preg_split('#(\n\|\r)#', $GLOBALS['wpo_cache_config']['cache_exception_browser_agents']);
1088
1089	if (!empty($exceptions)) {
1090	foreach ($exceptions as $exception) {
1091	if ('' == trim($exception)) continue;
1092
1093	if (preg_match('#'.$exception.'#i', $user_agent)) return false;
1094	}
1095	}
1096
1097	return true;
1098	}
1099	endif;
1100
1101	if (!function_exists('wpo_delete_files')) :
1102	/**
1103	* Deletes a specified source file or directory.
1104	*
1105	* If $src is a file, only that file will be deleted. If $src is a directory, the behavior depends on the
1106	* $recursive parameter. When $recursive is true, the directory and its contents (including files and subdirectories)
1107	* will be deleted. When $recursive is false, only the files in the top-level directory(eg. $src directory) will be deleted,
1108	* while the $src directory itself and its subdirectories will remain untouched.
1109	*
1110	* @param string $src The path to the source file or directory to delete.
1111	* @param bool $recursive (Optional) When set to true, the directory and its contents (including files and subdirectories)
1112	* will be deleted. If false, only the files in the top-level directory will be deleted while
1113	* its subdirectories will be preserved. Defaults to true.
1114	*
1115	* @return bool Returns true if the specified file or all files within the specified directory (and its subdirectories,
1116	* when $recursive is true) are successfully deleted. Returns false if any file(s) could not be deleted
1117	* due to file permissions or other reasons.
1118	*/
1119	function wpo_delete_files($src, $recursive = true) {
1120	// If the source doesn't exist, consider it deleted and return true
1121	if (!file_exists($src)) {
1122	return true;
1123	}
1124
1125	/*
1126	* If the source is a file, delete it and return the result.
1127	* If `unlink()` fails, we also verify if the file still exists before returning the result, as another
1128	* PHP process may have already deleted the file between the execution of `is_file()` and `unlink()` operations.
1129	*/
1130	if (is_file($src)) {
1131	if (!@unlink($src) && file_exists($src)) { // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged -- suppress PHP warning in case of failure
1132	return false;
1133	}
1134	return true;
1135	}
1136
1137	$success = true;
1138
1139	// If recursive is false, delete only the top-level files and return the result
1140	if (!$recursive) {
1141	$dir_handle = @opendir($src); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged -- suppress PHP warning in case of failure
1142
1143	/*
1144	* If opendir() is successful, process directory contents. If not, check if the directory exists.
1145	* If it exists, return false (failure). Otherwise, assume it's already deleted and return true (success).
1146	*/
1147	if (false !== $dir_handle) {
1148
1149	while (false !== ($file = readdir($dir_handle))) {
1150	if ('.' == $file \|\| '..' == $file) {
1151	continue;
1152	}
1153
1154	$full_path = $src . '/' . $file;
1155
1156	// If it's a file, delete it
1157	if (is_file($full_path)) {
1158	if (!wpo_delete_files($full_path)) {
1159	$success = false;
1160	}
1161	}
1162	}
1163
1164	closedir($dir_handle);
1165	} else {
1166	if (file_exists($src)) {
1167	$success = false;
1168	}
1169	}
1170
1171	return $success;
1172	}
1173
1174	// If recursive is true, delete all files and directories recursively
1175	$dir_handle = @opendir($src); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged -- suppress PHP warning in case of failure
1176
1177	/*
1178	* If opendir() is successful, process directory contents. If not, check if the directory exists.
1179	* If it exists, return false (failure). Otherwise, assume it's already deleted and return true (success).
1180	*/
1181	if (false !== $dir_handle) {
1182
1183	while (false !== ($file = readdir($dir_handle))) {
1184	if ('.' == $file \|\| '..' == $file) {
1185	continue;
1186	}
1187
1188	$full_path = $src . '/' . $file;
1189
1190	if (!wpo_delete_files($full_path)) {
1191	$success = false;
1192	}
1193	}
1194
1195	closedir($dir_handle);
1196	} else {
1197	if (file_exists($src)) {
1198	$success = false;
1199	}
1200	}
1201
1202	/*
1203	* Delete the source directory itself.
1204	* Success of `rmdir` operation is not recorded; we only ultimately care about emptying, not removing
1205	* entirely (empty folders in our context are harmless)
1206	*/
1207	if ($success) {
1208	@rmdir($src); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged -- suppress PHP warning in case of failure
1209	}
1210
1211	// Delete cached information about cache size
1212	WP_Optimize()->get_page_cache()->delete_cache_size_information();
1213
1214	return $success;
1215	}
1216	endif;
1217
1218	if (!function_exists('wpo_is_empty_dir')) :
1219	/**
1220	* Check if selected directory is empty or has only index.php which we added for security reasons.
1221	*
1222	* @param string $dir
1223	*
1224	* @return bool
1225	*/
1226	function wpo_is_empty_dir($dir) {
1227	if (!file_exists($dir) \|\| !is_dir($dir)) return false;
1228
1229	$handle = opendir($dir);
1230
1231	if (false === $handle) return false;
1232
1233	$is_empty = true;
1234	$file = readdir($handle);
1235
1236	while (false !== $file) {
1237
1238	if ('.' != $file && '..' != $file && 'index.php' != $file) {
1239	$is_empty = false;
1240	break;
1241	}
1242
1243	$file = readdir($handle);
1244	}
1245
1246	closedir($handle);
1247	return $is_empty;
1248	}
1249	endif;
1250
1251	/**
1252	* Either store for later output, or output now. Only the most-recent call will be effective.
1253	*
1254	* @param String\|Null $output - if not null, then the string to use when called by the shutdown action.
1255	*/
1256	if (!function_exists('wpo_cache_add_footer_output')) :
1257	function wpo_cache_add_footer_output($output = null) {
1258
1259	static $buffered = null;
1260
1261	if (function_exists('current_filter') && 'shutdown' == current_filter()) {
1262	// Only add the line if it was a page, not something else (e.g. REST response)
1263	if (function_exists('did_action') && did_action('wp_footer')) {
1264	echo "\n<!-- WP Optimize page cache - https://getwpo.com - ".$buffered." -->\n";
1265	} elseif (defined('WPO_CACHE_DEBUG') && WPO_CACHE_DEBUG && (!defined('REST_REQUEST') \|\| !REST_REQUEST)) {
1266	error_log('[CACHE DEBUG] '.wpo_current_url() . ' - ' . $buffered);
1267	}
1268	} else {
1269	if (null == $buffered && function_exists('add_action')) add_action('shutdown', 'wpo_cache_add_footer_output', 11);
1270	$buffered = $output;
1271	}
1272
1273	}
1274	endif;
1275
1276	/**
1277	* Remove variable names that shouldn't influence cache.
1278	*
1279	* @param array $variables List of variable names.
1280	*
1281	* @return array
1282	*/
1283	if (!function_exists('wpo_cache_maybe_ignore_query_variables')) :
1284	function wpo_cache_maybe_ignore_query_variables($variables) {
1285
1286	/**
1287	* Filters the current $_GET variables that will be used when caching or excluding from cache.
1288	* Currently:
1289	* - 'wpo_cache_debug' (Shows the reason for not being cached even when WP_DEBUG isn't set)
1290	* - 'doing_wp_cron' (alternative cron)
1291	* - 'aiosp_sitemap_path', 'aiosp_sitemap_page' (All in one SEO sitemap)
1292	* - 'xml_sitemap', 'seopress_sitemap', 'seopress_news', 'seopress_video', 'seopress_cpt', 'seopress_paged' (SEOPress sitemap)
1293	* - 'sitemap', 'sitemap_n' (YOAST SEO sitemap)
1294	*/
1295	$exclude_variables = array(
1296	'wpo_cache_debug', // Shows the reason for not being cached even when WP_DEBUG isn't set
1297	'doing_wp_cron', // alternative cron
1298	'aiosp_sitemap_path', // All in one SEO sitemap
1299	'aiosp_sitemap_page',
1300	'xml_sitemap', // SEOPress sitemap
1301	'seopress_sitemap',
1302	'seopress_news',
1303	'seopress_video',
1304	'seopress_cpt',
1305	'seopress_paged',
1306	'sitemap', // YOAST SEO sitemap
1307	'sitemap_n',
1308	);
1309	$exclude_variables = function_exists('apply_filters') ? apply_filters('wpo_cache_ignore_query_variables', $exclude_variables) : $exclude_variables;
1310
1311	if (empty($exclude_variables)) return $variables;
1312
1313	foreach ($exclude_variables as $variable) {
1314	$exclude = array_search($variable, $variables);
1315	if (false !== $exclude) {
1316	array_splice($variables, $exclude, 1);
1317	}
1318	}
1319
1320	return $variables;
1321	}
1322	endif;
1323
1324	/**
1325	* Get cache config
1326	*
1327	* @param string $key - The config item
1328	* @param mixed $default - The default value
1329	*
1330	* @return mixed
1331	*/
1332	if (!function_exists('wpo_cache_config_get')) :
1333	function wpo_cache_config_get($key, $default = false) {
1334	$config = $GLOBALS['wpo_cache_config'];
1335
1336	if (!$config) return false;
1337
1338	if (isset($config[$key])) {
1339	return $config[$key];
1340	} else {
1341	return $default;
1342	}
1343	}
1344	endif;
1345
1346	if (!function_exists('wpo_disable_cache_directories_viewing')) :
1347	function wpo_disable_cache_directories_viewing() {
1348	global $is_apache, $is_IIS, $is_iis7;
1349
1350	if (!is_dir(WPO_CACHE_FILES_DIR)) return;
1351
1352	// Create .htaccess file for apache server.
1353	if ($is_apache) {
1354	$htaccess_filename = WPO_CACHE_FILES_DIR . '/.htaccess';
1355
1356	// CS does not like heredoc
1357	// phpcs:disable
1358	$htaccess_content = <<<EOF
1359	# Disable directory browsing
1360	Options -Indexes
1361
1362	# Disable access to any files
1363	<FilesMatch ".*">
1364	Order allow,deny
1365	Deny from all
1366	</FilesMatch>
1367	EOF;
1368	// phpcs:enable
1369
1370	if (!is_file($htaccess_filename)) @file_put_contents($htaccess_filename, $htaccess_content); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged -- suppress the error when there is file permission issues
1371	}
1372
1373	// Create web.config file for IIS servers.
1374	if ($is_IIS \|\| $is_iis7) {
1375	$webconfig_filename = WPO_CACHE_FILES_DIR . '/web.config';
1376	$webconfig_content = "<configuration>\n<system.webServer>\n<authorization>\n<deny users=\"*\" />\n</authorization>\n</system.webServer>\n</configuration>\n";
1377
1378	if (!is_file($webconfig_filename)) @file_put_contents($webconfig_filename, $webconfig_content); // phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged -- suppress the error when there is file permission issues
1379	}
1380
1381	// Create empty index.php file for all servers.
1382	if (!is_file(WPO_CACHE_FILES_DIR . '/index.php')) @file_put_contents(WPO_CACHE_FILES_DIR . '/index.php', '');// phpcs:ignore Generic.PHP.NoSilencedErrors.Discouraged -- suppress the error when there is file permission issues
1383	}
1384	endif;
1385
1386	/**
1387	* Add the headers indicating why the page is not cached or served from cache
1388	*
1389	* @param string $message - The headers
1390	*
1391	* @return void
1392	*/
1393	if (!function_exists('wpo_cache_add_nocache_http_header')) :
1394	function wpo_cache_add_nocache_http_header($message = '') {
1395	if (!headers_sent()) {
1396	header('WPO-Cache-Status: not cached');
1397	header('WPO-Cache-Message: '. trim(str_replace(array("\r", "\n", ':'), ' ', strip_tags($message))));
1398	}
1399	}
1400	endif;
1401
1402	/**
1403	* Add the headers indicating why the page is not cached or served from cache by integrating with the send_headers filter
1404	*
1405	* @param string $message - The headers
1406	*
1407	* @return void
1408	*/
1409	if (!function_exists('wpo_cache_add_nocache_http_header_with_send_headers_action')) :
1410	function wpo_cache_add_nocache_http_header_with_send_headers_action($message = '') {
1411	static $buffered_message = null;
1412
1413	if (function_exists('current_filter') && 'send_headers' === current_filter() && $buffered_message && !headers_sent()) {
1414	wpo_cache_add_nocache_http_header($buffered_message);
1415	} else {
1416	if (!$buffered_message && function_exists('add_action')) add_action('send_headers', 'wpo_cache_add_nocache_http_header_with_send_headers_action', 11);
1417	$buffered_message = $message;
1418	}
1419	}
1420	endif;
1421
1422	/**
1423	* Check if feeds caching enabled
1424	*
1425	* @return bool
1426	*/
1427	if (!function_exists('wpo_feeds_caching_enabled')) :
1428	function wpo_feeds_caching_enabled() {
1429	return apply_filters('wpo_feeds_caching_enabled', true);
1430	}
1431	endif;
1432
1433	if (!function_exists('wpo_debug_backtrace_summary')) {
1434	function wpo_debug_backtrace_summary($ignore_class = null, $skip_frames = 0, $pretty = true) {
1435	static $truncate_paths;
1436
1437	$trace = debug_backtrace(false);
1438	$caller = array();
1439	$check_class = !is_null($ignore_class);
1440	$skip_frames++; // Skip this function.
1441
1442	if (!isset($truncate_paths)) {
1443	$truncate_paths = array(
1444	wpo_normalize_path(WP_CONTENT_DIR),
1445	wpo_normalize_path(ABSPATH),
1446	);
1447	}
1448
1449	foreach ($trace as $call) {
1450	if ($skip_frames > 0) {
1451	$skip_frames--;
1452	} elseif (isset($call['class'])) {
1453	if ($check_class && $ignore_class == $call['class']) {
1454	continue; // Filter out calls.
1455	}
1456
1457	$caller[] = "{$call['class']}{$call['type']}{$call['function']}";
1458	} else {
1459	if (in_array($call['function'], array('do_action', 'apply_filters', 'do_action_ref_array', 'apply_filters_ref_array'), true)) {
1460	$caller[] = "{$call['function']}('{$call['args'][0]}')";
1461	} elseif (in_array($call['function'], array('include', 'include_once', 'require', 'require_once'), true)) {
1462	$filename = isset($call['args'][0]) ? $call['args'][0] : '';
1463	$caller[] = $call['function'] . "('" . str_replace($truncate_paths, '', wpo_normalize_path($filename)) . "')";
1464	} else {
1465	$caller[] = $call['function'];
1466	}
1467	}
1468	}
1469	if ($pretty) {
1470	return implode(', ', array_reverse($caller));
1471	} else {
1472	return $caller;
1473	}
1474	}
1475	}
1476
1477	if (!function_exists('wpo_normalize_path')) {
1478	function wpo_normalize_path($path) {
1479	// Standardise all paths to use '/'.
1480	$path = str_replace('\\', '/', $path);
1481
1482	// Replace multiple slashes down to a singular, allowing for network shares having two slashes.
1483	$path = preg_replace('\|(?<=.)/+\|', '/', $path);
1484
1485	// Windows paths should uppercase the drive letter.
1486	if (':' === substr($path, 1, 1)) {
1487	$path = ucfirst($path);
1488	}
1489
1490	return $path;
1491	}
1492	}
1493