wp-optimize / vendor / mrclay / minify / lib / Minify.php

Minify.php in WP-Optimize – Cache, Compress images, Minify & Clean database to boost page speed & performance 3.4.2, at vendor/mrclay/minify/lib/Minify.php

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1	<?php
2	/**
3	* Class Minify
4	* @package Minify
5	*/
6
7	use Psr\Log\LoggerInterface;
8
9	/**
10	* Minify - Combines, minifies, and caches JavaScript and CSS files on demand.
11	*
12	* See README for usage instructions (for now).
13	*
14	* This library was inspired by {@link mailto:[email protected] jscsscomp by Maxim Martynyuk}
15	* and by the article {@link http://www.hunlock.com/blogs/Supercharged_Javascript "Supercharged JavaScript" by Patrick Hunlock}.
16	*
17	* @package Minify
18	* @author Ryan Grove <[email protected]>
19	* @author Stephen Clay <[email protected]>
20	* @copyright 2008 Ryan Grove, Stephen Clay. All rights reserved.
21	* @license http://opensource.org/licenses/bsd-license.php New BSD License
22	* @link https://github.com/mrclay/minify
23	*/
24	class Minify
25	{
26
27	/**
28	* API version
29	*
30	* This is only bumped when API breaks are done and should follow the major version of the library
31	*
32	* @var int
33	*/
34	const VERSION = 3;
35
36	const TYPE_CSS = 'text/css';
37	const TYPE_HTML = 'text/html';
38	// there is some debate over the ideal JS Content-Type, but this is the
39	// Apache default and what Yahoo! uses..
40	const TYPE_JS = 'application/x-javascript';
41	const URL_DEBUG = 'https://github.com/mrclay/minify/blob/master/docs/Debugging.wiki.md';
42
43	/**
44	* Any Minify_Cache_* object or null (i.e. no server cache is used)
45	*
46	* @var Minify_CacheInterface
47	*/
48	private $cache;
49
50	/**
51	* Active controller for current request
52	*
53	* @var Minify_Controller_Base
54	*/
55	protected $controller;
56
57	/**
58	* @var Minify_Env
59	*/
60	protected $env;
61
62	/**
63	* @var Minify_SourceInterface[]
64	*/
65	protected $sources;
66
67	/**
68	* @var string
69	*/
70	protected $selectionId;
71
72	/**
73	* Options for current request
74	*
75	* @var array
76	*/
77	protected $options;
78
79	/**
80	* @var LoggerInterface\|null
81	*/
82	protected $logger;
83
84	/**
85	* @param Minify_CacheInterface $cache
86	* @param LoggerInterface $logger
87	*/
88	public function __construct(Minify_CacheInterface $cache, LoggerInterface $logger = null)
89	{
90	$this->cache = $cache;
91	$this->logger = $logger;
92	}
93
94	/**
95	* Get default Minify options.
96	*
97	* @return array options for Minify
98	*/
99	public function getDefaultOptions()
100	{
101	return array(
102	'isPublic' => true,
103	'encodeOutput' => function_exists('gzdeflate'),
104	'encodeMethod' => null, // determine later
105	'encodeLevel' => 9,
106
107	'minifiers' => array(
108	Minify::TYPE_JS => array('JSMin\\JSMin', 'minify'),
109	Minify::TYPE_CSS => array('Minify_CSSmin', 'minify'),
110	Minify::TYPE_HTML => array('Minify_HTML', 'minify'),
111	),
112	'minifierOptions' => array(), // no minifier options
113
114	'contentTypeCharset' => 'utf-8',
115	'maxAge' => 1800, // 30 minutes
116	'rewriteCssUris' => true,
117	'bubbleCssImports' => false,
118	'quiet' => false, // serve() will send headers and output
119	'debug' => false,
120	'concatOnly' => false,
121	'invalidate' => false,
122
123	// if you override these, the response codes MUST be directly after
124	// the first space.
125	'badRequestHeader' => 'HTTP/1.0 400 Bad Request',
126	'errorHeader' => 'HTTP/1.0 500 Internal Server Error',
127
128	// callback function to see/modify content of all sources
129	'postprocessor' => null,
130	// file to require to load preprocessor
131	'postprocessorRequire' => null,
132
133	/**
134	* If this string is not empty AND the serve() option 'bubbleCssImports' is
135	* NOT set, then serve() will check CSS files for @import declarations that
136	* appear too late in the combined stylesheet. If found, serve() will prepend
137	* the output with this warning.
138	*/
139	'importWarning' => "/* See https://github.com/mrclay/minify/blob/master/docs/CommonProblems.wiki.md#imports-can-appear-in-invalid-locations-in-combined-css-files */\n"
140	);
141	}
142
143	/**
144	* Serve a request for a minified file.
145	*
146	* Here are the available options and defaults:
147	*
148	* 'isPublic' : send "public" instead of "private" in Cache-Control
149	* headers, allowing shared caches to cache the output. (default true)
150	*
151	* 'quiet' : set to true to have serve() return an array rather than sending
152	* any headers/output (default false)
153	*
154	* 'encodeOutput' : set to false to disable content encoding, and not send
155	* the Vary header (default true)
156	*
157	* 'encodeMethod' : generally you should let this be determined by
158	* HTTP_Encoder (leave null), but you can force a particular encoding
159	* to be returned, by setting this to 'gzip' or '' (no encoding)
160	*
161	* 'encodeLevel' : level of encoding compression (0 to 9, default 9)
162	*
163	* 'contentTypeCharset' : appended to the Content-Type header sent. Set to a falsey
164	* value to remove. (default 'utf-8')
165	*
166	* 'maxAge' : set this to the number of seconds the client should use its cache
167	* before revalidating with the server. This sets Cache-Control: max-age and the
168	* Expires header. Unlike the old 'setExpires' setting, this setting will NOT
169	* prevent conditional GETs. Note this has nothing to do with server-side caching.
170	*
171	* 'rewriteCssUris' : If true, serve() will automatically set the 'currentDir'
172	* minifier option to enable URI rewriting in CSS files (default true)
173	*
174	* 'bubbleCssImports' : If true, all @import declarations in combined CSS
175	* files will be move to the top. Note this may alter effective CSS values
176	* due to a change in order. (default false)
177	*
178	* 'debug' : set to true to minify all sources with the 'Lines' controller, which
179	* eases the debugging of combined files. This also prevents 304 responses.
180	* @see Minify_Lines::minify()
181	*
182	* 'concatOnly' : set to true to disable minification and simply concatenate the files.
183	* For JS, no minifier will be used. For CSS, only URI rewriting is still performed.
184	*
185	* 'minifiers' : to override Minify's default choice of minifier function for
186	* a particular content-type, specify your callback under the key of the
187	* content-type:
188	* <code>
189	* // call customCssMinifier($css) for all CSS minification
190	* $options['minifiers'][Minify::TYPE_CSS] = 'customCssMinifier';
191	*
192	* // don't minify Javascript at all
193	* $options['minifiers'][Minify::TYPE_JS] = 'Minify::nullMinifier';
194	* </code>
195	*
196	* 'minifierOptions' : to send options to the minifier function, specify your options
197	* under the key of the content-type. E.g. To send the CSS minifier an option:
198	* <code>
199	* // give CSS minifier array('optionName' => 'optionValue') as 2nd argument
200	* $options['minifierOptions'][Minify::TYPE_CSS]['optionName'] = 'optionValue';
201	* </code>
202	*
203	* 'contentType' : (optional) this is only needed if your file extension is not
204	* js/css/html. The given content-type will be sent regardless of source file
205	* extension, so this should not be used in a Groups config with other
206	* Javascript/CSS files.
207	*
208	* 'importWarning' : serve() will check CSS files for @import declarations that
209	* appear too late in the combined stylesheet. If found, serve() will prepend
210	* the output with this warning. To disable this, set this option to empty string.
211	*
212	* Any controller options are documented in that controller's createConfiguration() method.
213	*
214	* @param Minify_ControllerInterface $controller instance of subclass of Minify_Controller_Base
215	*
216	* @param array $options controller/serve options
217	*
218	* @return null\|array if the 'quiet' option is set to true, an array
219	* with keys "success" (bool), "statusCode" (int), "content" (string), and
220	* "headers" (array).
221	*
222	* @throws Exception
223	*/
224	public function serve(Minify_ControllerInterface $controller, $options = array())
225	{
226	$this->env = $controller->getEnv();
227
228	$options = array_merge($this->getDefaultOptions(), $options);
229
230	$config = $controller->createConfiguration($options);
231
232	$this->sources = $config->getSources();
233	$this->selectionId = $config->getSelectionId();
234	$this->options = $this->analyzeSources($config->getOptions());
235
236	if (!$this->options['quiet'] && !headers_sent()) {
237	ini_set('zlib.output_compression', '0');
238	}
239
240	// check request validity
241	if (!$this->sources) {
242	// invalid request!
243	if (! $this->options['quiet']) {
244	$this->errorExit($this->options['badRequestHeader'], self::URL_DEBUG);
245	} else {
246	list(, $statusCode) = explode(' ', $this->options['badRequestHeader']);
247
248	return array(
249	'success' => false,
250	'statusCode' => (int)$statusCode,
251	'content' => '',
252	'headers' => array(),
253	);
254	}
255	}
256
257	$this->controller = $controller;
258
259	if ($this->options['debug']) {
260	$this->setupDebug();
261	$this->options['maxAge'] = 0;
262	}
263
264	// determine encoding
265	if ($this->options['encodeOutput']) {
266	$sendVary = true;
267	if ($this->options['encodeMethod'] !== null) {
268	// controller specifically requested this
269	$contentEncoding = $this->options['encodeMethod'];
270	} else {
271	// sniff request header
272	// depending on what the client accepts, $contentEncoding may be
273	// 'x-gzip' while our internal encodeMethod is 'gzip'. Calling
274	// getAcceptedEncoding(false, false) leaves out compress and deflate as options.
275	$list = HTTP_Encoder::getAcceptedEncoding(false, false);
276	list($this->options['encodeMethod'], $contentEncoding) = $list;
277	$sendVary = ! HTTP_Encoder::isBuggyIe();
278	}
279	} else {
280	$this->options['encodeMethod'] = ''; // identity (no encoding)
281	}
282
283	// check client cache
284	$cgOptions = array(
285	'lastModifiedTime' => $this->options['lastModifiedTime'],
286	'isPublic' => $this->options['isPublic'],
287	'encoding' => $this->options['encodeMethod'],
288	'invalidate' => $this->options['invalidate'],
289	);
290
291	if ($this->options['maxAge'] > 0) {
292	$cgOptions['maxAge'] = $this->options['maxAge'];
293	} elseif ($this->options['debug']) {
294	$cgOptions['invalidate'] = true;
295	}
296
297	$cg = new HTTP_ConditionalGet($cgOptions);
298	if ($cg->cacheIsValid) {
299	// client's cache is valid
300	if (! $this->options['quiet']) {
301	$cg->sendHeaders();
302
303	return;
304	}
305
306	return array(
307	'success' => true,
308	'statusCode' => 304,
309	'content' => '',
310	'headers' => $cg->getHeaders(),
311	);
312	}
313
314	// client will need output
315	$headers = $cg->getHeaders();
316	unset($cg);
317
318	if ($this->options['contentType'] === self::TYPE_CSS && $this->options['rewriteCssUris']) {
319	$this->setupUriRewrites();
320	}
321
322	if ($this->options['concatOnly']) {
323	$this->options['minifiers'][self::TYPE_JS] = false;
324	foreach ($this->sources as $key => $source) {
325	if ($this->options['contentType'] === self::TYPE_JS) {
326	$source->setMinifier('Minify::nullMinifier');
327	} elseif ($this->options['contentType'] === self::TYPE_CSS) {
328	$source->setMinifier(array('Minify_CSSmin', 'minify'));
329	$sourceOpts = $source->getMinifierOptions();
330	$sourceOpts['compress'] = false;
331	$source->setMinifierOptions($sourceOpts);
332	}
333	}
334	}
335
336	// check server cache
337	if (! $this->options['debug']) {
338	// using cache
339	// the goal is to use only the cache methods to sniff the length and
340	// output the content, as they do not require ever loading the file into
341	// memory.
342	$cacheId = $this->_getCacheId();
343	$fullCacheId = ($this->options['encodeMethod']) ? $cacheId . '.gz' : $cacheId;
344
345	// check cache for valid entry
346	$cacheIsReady = $this->cache->isValid($fullCacheId, $this->options['lastModifiedTime']);
347	if ($cacheIsReady) {
348	$cacheContentLength = $this->cache->getSize($fullCacheId);
349	} else {
350	// generate & cache content
351	try {
352	$content = $this->combineMinify();
353	} catch (Exception $e) {
354	$this->logger && $this->logger->critical($e->getMessage());
355	if (! $this->options['quiet']) {
356	$this->errorExit($this->options['errorHeader'], self::URL_DEBUG);
357	}
358	throw $e;
359	}
360	$this->cache->store($cacheId, $content);
361	if (function_exists('gzencode') && $this->options['encodeMethod']) {
362	$this->cache->store($cacheId . '.gz', gzencode($content, $this->options['encodeLevel']));
363	}
364	}
365	} else {
366	// no cache
367	$cacheIsReady = false;
368	try {
369	$content = $this->combineMinify();
370	} catch (Exception $e) {
371	$this->logger && $this->logger->critical($e->getMessage());
372	if (! $this->options['quiet']) {
373	$this->errorExit($this->options['errorHeader'], self::URL_DEBUG);
374	}
375	throw $e;
376	}
377	}
378	if (! $cacheIsReady && $this->options['encodeMethod']) {
379	// still need to encode
380	$content = gzencode($content, $this->options['encodeLevel']);
381	}
382
383	// add headers
384	if ($cacheIsReady) {
385	$headers['Content-Length'] = $cacheContentLength;
386	} else {
387	if (function_exists('mb_strlen') && ((int)ini_get('mbstring.func_overload') & 2)) {
388	$headers['Content-Length'] = mb_strlen($content, '8bit');
389	} else {
390	$headers['Content-Length'] = strlen($content);
391	}
392	}
393
394	$headers['Content-Type'] = $this->options['contentType'];
395	if ($this->options['contentTypeCharset']) {
396	$headers['Content-Type'] .= '; charset=' . $this->options['contentTypeCharset'];
397	}
398
399	if ($this->options['encodeMethod'] !== '') {
400	$headers['Content-Encoding'] = $contentEncoding;
401	}
402	if ($this->options['encodeOutput'] && $sendVary) {
403	$headers['Vary'] = 'Accept-Encoding';
404	}
405
406	if (! $this->options['quiet']) {
407	// output headers & content
408	foreach ($headers as $name => $val) {
409	header($name . ': ' . $val);
410	}
411	if ($cacheIsReady) {
412	$this->cache->display($fullCacheId);
413	} else {
414	echo $content;
415	}
416	} else {
417	return array(
418	'success' => true,
419	'statusCode' => 200,
420	'content' => $cacheIsReady ? $this->cache->fetch($fullCacheId) : $content,
421	'headers' => $headers,
422	);
423	}
424	}
425
426	/**
427	* Return combined minified content for a set of sources
428	*
429	* No internal caching will be used and the content will not be HTTP encoded.
430	*
431	* @param array $sources array of filepaths and/or Minify_Source objects
432	*
433	* @param array $options (optional) array of options for serve.
434	*
435	* @return string
436	*/
437	public function combine($sources, $options = array())
438	{
439	$tmpCache = $this->cache;
440	$this->cache = new Minify_Cache_Null();
441
442	$env = new Minify_Env();
443	$sourceFactory = new Minify_Source_Factory($env, array(
444	'checkAllowDirs' => false,
445	), $this->cache);
446	$controller = new Minify_Controller_Files($env, $sourceFactory, $this->logger);
447
448	$options = array_merge($options, array(
449	'files' => (array)$sources,
450	'quiet' => true,
451	'encodeMethod' => '',
452	'lastModifiedTime' => 0,
453	));
454	$out = $this->serve($controller, $options);
455
456	$this->cache = $tmpCache;
457
458	return $out['content'];
459	}
460
461	/**
462	* Show an error page
463	*
464	* @param string $header Full header. E.g. 'HTTP/1.0 500 Internal Server Error'
465	* @param string $url URL to direct the user to
466	* @param string $msgHtml HTML message for the client
467	*
468	* @return void
469	* @internal This is not part of the public API and is subject to change
470	* @access private
471	*/
472	public function errorExit($header, $url = '', $msgHtml = '')
473	{
474	$url = htmlspecialchars($url, ENT_QUOTES);
475	list(, $h1) = explode(' ', $header, 2);
476	$h1 = htmlspecialchars($h1);
477	// FastCGI environments require 3rd arg to header() to be set
478	list(, $code) = explode(' ', $header, 3);
479	header($header, true, $code);
480	header('Content-Type: text/html; charset=utf-8');
481	echo "<h1>$h1</h1>";
482	if ($msgHtml) {
483	echo $msgHtml;
484	}
485	if ($url) {
486	echo "<p>Please see <a href='$url'>$url</a>.</p>";
487	}
488	exit;
489	}
490
491	/**
492	* Default minifier for .min or -min JS files.
493	*
494	* @param string $content
495	* @return string
496	*/
497	public static function nullMinifier($content)
498	{
499	if (isset($content[0]) && $content[0] === "\xef") {
500	$content = substr($content, 3);
501	}
502	$content = str_replace("\r\n", "\n", $content);
503
504	return trim($content);
505	}
506
507	/**
508	* Setup CSS sources for URI rewriting
509	*/
510	protected function setupUriRewrites()
511	{
512	foreach ($this->sources as $key => $source) {
513	$file = $this->env->normalizePath($source->getFilePath());
514	$minifyOptions = $source->getMinifierOptions();
515
516	if ($file
517	&& !isset($minifyOptions['currentDir'])
518	&& !isset($minifyOptions['prependRelativePath'])) {
519	$minifyOptions['currentDir'] = dirname($file);
520	$source->setMinifierOptions($minifyOptions);
521	}
522	}
523	}
524
525	/**
526	* Set up sources to use Minify_Lines
527	*/
528	protected function setupDebug()
529	{
530	foreach ($this->sources as $source) {
531	$source->setMinifier(array('Minify_Lines', 'minify'));
532	$id = $source->getId();
533	$source->setMinifierOptions(array(
534	'id' => (is_file($id) ? basename($id) : $id),
535	));
536	}
537	}
538
539	/**
540	* Combines sources and minifies the result.
541	*
542	* @return string
543	*
544	* @throws Exception
545	*/
546	protected function combineMinify()
547	{
548	$type = $this->options['contentType']; // ease readability
549
550	// when combining scripts, make sure all statements separated and
551	// trailing single line comment is terminated
552	$implodeSeparator = ($type === self::TYPE_JS) ? "\n;" : '';
553
554	// allow the user to pass a particular array of options to each
555	// minifier (designated by type). source objects may still override
556	// these
557	if (isset($this->options['minifierOptions'][$type])) {
558	$defaultOptions = $this->options['minifierOptions'][$type];
559	} else {
560	$defaultOptions = array();
561	}
562
563	// if minifier not set, default is no minification. source objects
564	// may still override this
565	if (isset($this->options['minifiers'][$type])) {
566	$defaultMinifier = $this->options['minifiers'][$type];
567	} else {
568	$defaultMinifier = false;
569	}
570
571	// process groups of sources with identical minifiers/options
572	$content = array();
573	$i = 0;
574	$l = count($this->sources);
575	$groupToProcessTogether = array();
576	$lastMinifier = null;
577	$lastOptions = null;
578	do {
579	// get next source
580	$source = null;
581	if ($i < $l) {
582	$source = $this->sources[$i];
583	$sourceContent = $source->getContent();
584
585	// allow the source to override our minifier and options
586	$minifier = $source->getMinifier();
587	if (!$minifier) {
588	$minifier = $defaultMinifier;
589	}
590	$options = array_merge($defaultOptions, $source->getMinifierOptions());
591	}
592	// do we need to process our group right now?
593	if ($i > 0 // yes, we have at least the first group populated
594	&& (
595	! $source // yes, we ran out of sources
596	\|\| $type === self::TYPE_CSS // yes, to process CSS individually (avoiding PCRE bugs/limits)
597	\|\| $minifier !== $lastMinifier // yes, minifier changed
598	\|\| $options !== $lastOptions // yes, options changed
599	)) {
600	// minify previous sources with last settings
601	$imploded = implode($implodeSeparator, $groupToProcessTogether);
602	$groupToProcessTogether = array();
603	if ($lastMinifier) {
604	try {
605	$content[] = call_user_func($lastMinifier, $imploded, $lastOptions);
606	} catch (Exception $e) {
607	throw new Exception("Exception in minifier: " . $e->getMessage());
608	}
609	} else {
610	$content[] = $imploded;
611	}
612	}
613	// add content to the group
614	if ($source) {
615	$groupToProcessTogether[] = $sourceContent;
616	$lastMinifier = $minifier;
617	$lastOptions = $options;
618	}
619	$i++;
620	} while ($source);
621
622	$content = implode($implodeSeparator, $content);
623
624	if ($type === self::TYPE_CSS && false !== strpos($content, '@import')) {
625	$content = $this->handleCssImports($content);
626	}
627
628	// do any post-processing (esp. for editing build URIs)
629	if ($this->options['postprocessorRequire']) {
630	require_once $this->options['postprocessorRequire'];
631	}
632	if ($this->options['postprocessor']) {
633	$content = call_user_func($this->options['postprocessor'], $content, $type);
634	}
635
636	return $content;
637	}
638
639	/**
640	* Make a unique cache id for for this request.
641	*
642	* Any settings that could affect output are taken into consideration
643	*
644	* @param string $prefix
645	*
646	* @return string
647	*/
648	protected function _getCacheId($prefix = 'minify')
649	{
650	$name = preg_replace('/[^a-zA-Z0-9\\.=_,]/', '', $this->selectionId);
651	$name = preg_replace('/\\.+/', '.', $name);
652	$name = substr($name, 0, 100 - 34 - strlen($prefix));
653	$md5 = md5(serialize(array(
654	Minify_SourceSet::getDigest($this->sources),
655	$this->options['minifiers'],
656	$this->options['minifierOptions'],
657	$this->options['postprocessor'],
658	$this->options['bubbleCssImports'],
659	Minify::VERSION,
660	)));
661
662	return "{$prefix}_{$name}_{$md5}";
663	}
664
665	/**
666	* Bubble CSS @imports to the top or prepend a warning if an import is detected not at the top.
667	*
668	* @param string $css
669	*
670	* @return string
671	*/
672	protected function handleCssImports($css)
673	{
674	if ($this->options['bubbleCssImports']) {
675	// bubble CSS imports
676	preg_match_all('/@import.*?;/', $css, $imports);
677	$css = implode('', $imports[0]) . preg_replace('/@import.*?;/', '', $css);
678
679	return $css;
680	}
681
682	if ('' === $this->options['importWarning']) {
683	return $css;
684	}
685
686	// remove comments so we don't mistake { in a comment as a block
687	$noCommentCss = preg_replace('@/\\[\\s\\S]?\\*/@', '', $css);
688	$lastImportPos = strrpos($noCommentCss, '@import');
689	$firstBlockPos = strpos($noCommentCss, '{');
690	if (false !== $lastImportPos
691	&& false !== $firstBlockPos
692	&& $firstBlockPos < $lastImportPos
693	) {
694	// { appears before @import : prepend warning
695	$css = $this->options['importWarning'] . $css;
696	}
697
698	return $css;
699	}
700
701	/**
702	* Analyze sources (if there are any) and set $options 'contentType'
703	* and 'lastModifiedTime' if they already aren't.
704	*
705	* @param array $options options for Minify
706	*
707	* @return array options for Minify
708	*/
709	protected function analyzeSources($options = array())
710	{
711	if (!$this->sources) {
712	return $options;
713	}
714
715	$type = null;
716	foreach ($this->sources as $source) {
717	$sourceType = $source->getContentType();
718
719	if (!empty($options['contentType'])) {
720	// just verify sources have null content type or match the options
721	if ($sourceType !== null && $sourceType !== $options['contentType']) {
722	$this->logger && $this->logger->warning("ContentType mismatch: '{$sourceType}' != '{$options['contentType']}'");
723
724	$this->sources = array();
725
726	return $options;
727	}
728
729	continue;
730	}
731
732	if ($type === null) {
733	$type = $sourceType;
734	} elseif ($sourceType !== $type) {
735	$this->logger && $this->logger->warning("ContentType mismatch: '{$sourceType}' != '{$type}'");
736
737	$this->sources = array();
738
739	return $options;
740	}
741	}
742
743	if (empty($options['contentType'])) {
744	if (null === $type) {
745	$type = 'text/plain';
746	}
747	$options['contentType'] = $type;
748	}
749
750	// last modified is needed for caching, even if setExpires is set
751	if (!isset($options['lastModifiedTime'])) {
752	$max = 0;
753	foreach ($this->sources as $source) {
754	$max = max($source->getLastModified(), $max);
755	}
756	$options['lastModifiedTime'] = $max;
757	}
758
759	return $options;
760	}
761	}
762