| 1 |
<?php |
| 2 |
/** |
| 3 |
* Cache Preloading functionalities |
| 4 |
* |
| 5 |
* @package PoweredCache |
| 6 |
*/ |
| 7 |
|
| 8 |
namespace PoweredCache; |
| 9 |
|
| 10 |
use PoweredCache\Async\CachePreloader; |
| 11 |
use function PoweredCache\Utils\permalink_structure_has_trailingslash; |
| 12 |
use function PoweredCache\Utils\site_cache_dir; |
| 13 |
|
| 14 |
/** |
| 15 |
* Class Preloader |
| 16 |
*/ |
| 17 |
class Preloader { |
| 18 |
/** |
| 19 |
* Plugin settings |
| 20 |
* |
| 21 |
* @var $settings |
| 22 |
*/ |
| 23 |
private $settings; |
| 24 |
|
| 25 |
/** |
| 26 |
* Instance of CachePreloader |
| 27 |
* |
| 28 |
* @var CachePreloader |
| 29 |
*/ |
| 30 |
private $cache_preloader; |
| 31 |
|
| 32 |
/** |
| 33 |
* Return an instance of the current class |
| 34 |
* |
| 35 |
* @return Preloader |
| 36 |
* @since 1.0 |
| 37 |
*/ |
| 38 |
public static function factory() { |
| 39 |
|
| 40 |
static $instance; |
| 41 |
|
| 42 |
if ( ! $instance ) { |
| 43 |
$instance = new self(); |
| 44 |
$instance->setup(); |
| 45 |
} |
| 46 |
|
| 47 |
return $instance; |
| 48 |
} |
| 49 |
|
| 50 |
/** |
| 51 |
* Setup routine |
| 52 |
*/ |
| 53 |
public function setup() { |
| 54 |
$this->settings = \PoweredCache\Utils\get_settings(); |
| 55 |
|
| 56 |
// bail if the preload not activated |
| 57 |
if ( ! $this->settings['enable_cache_preload'] ) { |
| 58 |
return; |
| 59 |
} |
| 60 |
|
| 61 |
$this->cache_preloader = CachePreloader::factory(); |
| 62 |
add_filter( 'wp_resource_hints', [ $this, 'dns_prefetch' ], 10, 2 ); |
| 63 |
|
| 64 |
/** |
| 65 |
* Page cache needs to be activated to get benefits of preloading |
| 66 |
*/ |
| 67 |
if ( ! $this->settings['enable_page_cache'] ) { |
| 68 |
return; |
| 69 |
} |
| 70 |
|
| 71 |
add_action( 'admin_bar_menu', [ $this, 'admin_bar_menu' ] ); |
| 72 |
add_action( 'admin_post_powered_cache_preload_cache', [ $this, 'start_preload' ] ); |
| 73 |
add_action( 'powered_cache_purge_all_cache', [ $this, 'setup_preload_queue' ] ); |
| 74 |
add_action( 'powered_cache_clean_site_cache_dir', [ $this, 'setup_preload_queue' ] ); |
| 75 |
add_action( 'powered_cache_advanced_cache_purge_post', [ $this, 'add_purged_urls_to_preload_queue' ], 10, 2 ); |
| 76 |
add_action( 'powered_cache_expired_files_deleted', [ $this, 'add_expired_urls_to_preload_queue' ], 10, 2 ); |
| 77 |
} |
| 78 |
|
| 79 |
/** |
| 80 |
* Preload Admin bar menu |
| 81 |
* |
| 82 |
* @param object $wp_admin_bar Admin bar object |
| 83 |
* |
| 84 |
* @since 1.0 |
| 85 |
*/ |
| 86 |
public function admin_bar_menu( $wp_admin_bar ) { |
| 87 |
if ( POWERED_CACHE_IS_NETWORK && ! current_user_can( 'manage_network' ) ) { |
| 88 |
return; |
| 89 |
} |
| 90 |
|
| 91 |
if ( ! current_user_can( 'manage_options' ) ) { |
| 92 |
return; |
| 93 |
} |
| 94 |
|
| 95 |
$wp_admin_bar->add_menu( |
| 96 |
array( |
| 97 |
'id' => 'preload-cache', |
| 98 |
'title' => __( 'Preload Cache', 'powered-cache' ), |
| 99 |
'href' => wp_nonce_url( admin_url( 'admin-post.php?action=powered_cache_preload_cache' ), 'powered_cache_preload_cache' ), |
| 100 |
'parent' => 'powered-cache', |
| 101 |
) |
| 102 |
); |
| 103 |
} |
| 104 |
|
| 105 |
/** |
| 106 |
* Add preloading items to queue |
| 107 |
*/ |
| 108 |
public function start_preload() { |
| 109 |
if ( ! wp_verify_nonce( $_GET['_wpnonce'], 'powered_cache_preload_cache' ) ) { |
| 110 |
wp_nonce_ays( '' ); |
| 111 |
} |
| 112 |
|
| 113 |
if ( POWERED_CACHE_IS_NETWORK && ! current_user_can( 'manage_network' ) ) { |
| 114 |
$redirect_url = add_query_arg( 'pc_action', 'start_preload_err_permission', wp_get_referer() ); |
| 115 |
wp_safe_redirect( esc_url_raw( $redirect_url ) ); |
| 116 |
exit; |
| 117 |
} |
| 118 |
|
| 119 |
if ( ! current_user_can( 'manage_options' ) ) { |
| 120 |
$redirect_url = add_query_arg( 'pc_action', 'start_preload_err_permission', wp_get_referer() ); |
| 121 |
wp_safe_redirect( esc_url_raw( $redirect_url ) ); |
| 122 |
exit; |
| 123 |
} |
| 124 |
|
| 125 |
$this->setup_preload_queue(); |
| 126 |
|
| 127 |
$redirect_url = add_query_arg( 'pc_action', 'start_preload', wp_get_referer() ); |
| 128 |
wp_safe_redirect( esc_url_raw( $redirect_url ) ); |
| 129 |
exit; |
| 130 |
} |
| 131 |
|
| 132 |
/** |
| 133 |
* Setup preload |
| 134 |
*/ |
| 135 |
public function setup_preload_queue() { |
| 136 |
// cancel existing process before populating |
| 137 |
$this->cache_preloader->cancel_process(); |
| 138 |
|
| 139 |
if ( POWERED_CACHE_IS_NETWORK ) { |
| 140 |
$sites = get_sites( [ 'fields' => 'ids' ] ); |
| 141 |
foreach ( $sites as $site_id ) { |
| 142 |
switch_to_blog( $site_id ); |
| 143 |
\PoweredCache\Utils\log( sprintf( 'Populating preload queue for site: %d', $site_id ) ); |
| 144 |
$this->populate_preload_queue(); |
| 145 |
restore_current_blog(); |
| 146 |
} |
| 147 |
} else { |
| 148 |
$this->populate_preload_queue(); |
| 149 |
} |
| 150 |
|
| 151 |
$this->cache_preloader->save()->dispatch(); |
| 152 |
|
| 153 |
if ( $this->settings['enable_sitemap_preload'] && function_exists( '\PoweredCachePremium\Utils\preload_sitemap' ) ) { |
| 154 |
\PoweredCachePremium\Utils\preload_sitemap(); |
| 155 |
} |
| 156 |
} |
| 157 |
|
| 158 |
/** |
| 159 |
* Populate preload queue based on settings |
| 160 |
*/ |
| 161 |
protected function populate_preload_queue() { |
| 162 |
$preload_urls = []; |
| 163 |
|
| 164 |
if ( $this->settings['preload_homepage'] ) { |
| 165 |
$front_page = get_option( 'page_on_front' ); |
| 166 |
if ( ! empty( $front_page ) ) { |
| 167 |
$front_page_url = get_permalink( $front_page ); |
| 168 |
$preload_urls[] = $front_page_url; |
| 169 |
\PoweredCache\Utils\log( sprintf( 'Front page URL added to preload queue: %s', $front_page_url ) ); |
| 170 |
} |
| 171 |
|
| 172 |
$posts_page = get_option( 'page_for_posts' ); |
| 173 |
if ( ! empty( $posts_page ) ) { |
| 174 |
$posts_page_url = get_permalink( $posts_page ); |
| 175 |
$preload_urls[] = $posts_page_url; |
| 176 |
\PoweredCache\Utils\log( sprintf( 'Posts Page URL added to preload queue: %s', $posts_page_url ) ); |
| 177 |
} |
| 178 |
|
| 179 |
/** |
| 180 |
* trailingslashit important here, |
| 181 |
* likely redirection is not followed for non-blocking preload request |
| 182 |
*/ |
| 183 |
$home_url = trailingslashit( get_home_url() ); |
| 184 |
$preload_urls[] = $home_url; |
| 185 |
\PoweredCache\Utils\log( sprintf( 'Home URL added to preload queue: %s', $home_url ) ); |
| 186 |
} |
| 187 |
|
| 188 |
if ( $this->settings['preload_public_posts'] ) { |
| 189 |
$public_post_urls = $this->prepare_public_posts_urls(); |
| 190 |
$preload_urls = array_merge( $preload_urls, $public_post_urls ); |
| 191 |
\PoweredCache\Utils\log( sprintf( 'Public posts added to preload queue. ' ) ); |
| 192 |
} |
| 193 |
|
| 194 |
if ( $this->settings['preload_public_tax'] ) { |
| 195 |
$public_tax_term_urls = $this->prepare_public_tax_terms_urls(); |
| 196 |
$preload_urls = array_merge( $preload_urls, $public_tax_term_urls ); |
| 197 |
\PoweredCache\Utils\log( sprintf( 'Public tax terms added to preload queue. ' ) ); |
| 198 |
} |
| 199 |
|
| 200 |
foreach ( $preload_urls as $url ) { |
| 201 |
$this->cache_preloader->push_to_queue( $url ); |
| 202 |
} |
| 203 |
} |
| 204 |
|
| 205 |
|
| 206 |
/** |
| 207 |
* Add related pages to preload queue when the cache got cleared |
| 208 |
* |
| 209 |
* @param int $post_id Post ID |
| 210 |
* @param array $urls The URL list of the related pages that cleared during post update |
| 211 |
* |
| 212 |
* @since 2.0 |
| 213 |
*/ |
| 214 |
public function add_purged_urls_to_preload_queue( $post_id, $urls ) { |
| 215 |
if ( ! $urls ) { |
| 216 |
return; |
| 217 |
} |
| 218 |
|
| 219 |
foreach ( $urls as $url ) { |
| 220 |
$this->cache_preloader->push_to_queue( $url ); |
| 221 |
\PoweredCache\Utils\log( sprintf( 'Pushed to preload queue [add_purged_urls_to_preload_queue]: %s', $url ) ); |
| 222 |
} |
| 223 |
|
| 224 |
$this->cache_preloader->save()->dispatch(); |
| 225 |
} |
| 226 |
|
| 227 |
/** |
| 228 |
* Requeue deleted URLs |
| 229 |
* |
| 230 |
* @param array $expired_files Full path of cached item |
| 231 |
*/ |
| 232 |
public function add_expired_urls_to_preload_queue( $expired_files ) { |
| 233 |
|
| 234 |
/** |
| 235 |
* Filters expired urls preloading status |
| 236 |
* |
| 237 |
* @hook powered_cache_preload_expired_urls |
| 238 |
* |
| 239 |
* @param {boolean} $status True by default for preloading urls. |
| 240 |
* |
| 241 |
* @return {boolean} New value. |
| 242 |
* @since 2.0 |
| 243 |
*/ |
| 244 |
$preload_expired_urls = apply_filters( 'powered_cache_preload_expired_urls', true ); |
| 245 |
|
| 246 |
if ( true !== $preload_expired_urls ) { |
| 247 |
return; |
| 248 |
} |
| 249 |
|
| 250 |
/** |
| 251 |
* Get dir path without cache file name (eg index.html) |
| 252 |
*/ |
| 253 |
$expired_files = array_map( |
| 254 |
function ( $item ) { |
| 255 |
return dirname( $item ); |
| 256 |
}, |
| 257 |
$expired_files |
| 258 |
); |
| 259 |
|
| 260 |
$expired_files = array_unique( $expired_files ); // prevent double request due to meta.php + index.php file |
| 261 |
|
| 262 |
// replace path with site url |
| 263 |
$expired_urls = str_replace( site_cache_dir(), trailingslashit( get_site_url() ), $expired_files ); |
| 264 |
$has_trailingslash = permalink_structure_has_trailingslash(); |
| 265 |
|
| 266 |
foreach ( $expired_urls as $url ) { |
| 267 |
if ( $has_trailingslash ) { |
| 268 |
$url = trailingslashit( $url ); |
| 269 |
} |
| 270 |
$this->cache_preloader->push_to_queue( $url ); |
| 271 |
\PoweredCache\Utils\log( sprintf( 'Pushed to preload queue [add_expired_urls_to_preload_queue]: %s', $url ) ); |
| 272 |
} |
| 273 |
|
| 274 |
$this->cache_preloader->save()->dispatch(); |
| 275 |
} |
| 276 |
|
| 277 |
/** |
| 278 |
* Prep. public post urls for preload queue |
| 279 |
*/ |
| 280 |
public function prepare_public_posts_urls() { |
| 281 |
global $wpdb; |
| 282 |
|
| 283 |
$public_posts_url = []; |
| 284 |
/** |
| 285 |
* Filters posts offset for preload. |
| 286 |
* |
| 287 |
* @hook powered_cache_preload_public_posts_offset |
| 288 |
* |
| 289 |
* @param {int} $offset The offset of the post query. |
| 290 |
* |
| 291 |
* @return {int} New value. |
| 292 |
* @since 2.0 |
| 293 |
*/ |
| 294 |
$offset = (int) apply_filters( 'powered_cache_preload_public_posts_offset', 0 ); |
| 295 |
$max_preload_item = $this->preload_max_post_count(); |
| 296 |
|
| 297 |
\PoweredCache\Utils\log( sprintf( 'Adding public posts to queue' ) ); |
| 298 |
\PoweredCache\Utils\log( sprintf( 'OFFSET: %s', $offset ) ); |
| 299 |
\PoweredCache\Utils\log( sprintf( 'LIMIT: %s', $max_preload_item ) ); |
| 300 |
|
| 301 |
/** |
| 302 |
* Filters public post types. |
| 303 |
* |
| 304 |
* @hook powered_cache_preload_post_types |
| 305 |
* |
| 306 |
* @param {array} $types Public post types. |
| 307 |
* |
| 308 |
* @return {array} New value. |
| 309 |
* @since 1.0 |
| 310 |
*/ |
| 311 |
$types = apply_filters( |
| 312 |
'powered_cache_preload_post_types', |
| 313 |
get_post_types( |
| 314 |
array( |
| 315 |
'public' => true, |
| 316 |
'publicly_queryable' => true, |
| 317 |
), |
| 318 |
'names', |
| 319 |
'or' |
| 320 |
) |
| 321 |
); |
| 322 |
|
| 323 |
$types = array_map( 'esc_sql', $types ); |
| 324 |
$types = "'" . implode( "','", $types ) . "'"; |
| 325 |
$posts = $wpdb->get_col( "SELECT ID FROM {$wpdb->posts} WHERE ( post_type IN ( $types ) ) AND post_status = 'publish' ORDER BY ID ASC LIMIT {$offset},{$max_preload_item}" ); // phpcs:ignore |
| 326 |
|
| 327 |
\PoweredCache\Utils\log( sprintf( 'Found posts: %s', count( $posts ) ) ); |
| 328 |
|
| 329 |
foreach ( $posts as $post_id ) { |
| 330 |
$public_posts_url[] = get_permalink( $post_id ); |
| 331 |
} |
| 332 |
|
| 333 |
return $public_posts_url; |
| 334 |
} |
| 335 |
|
| 336 |
/** |
| 337 |
* Prep. public tax terms urls for preload queue |
| 338 |
*/ |
| 339 |
public function prepare_public_tax_terms_urls() { |
| 340 |
$public_tax_term_urls = []; |
| 341 |
$taxonomies = get_taxonomies( [ 'public' => true ] ); |
| 342 |
|
| 343 |
/** |
| 344 |
* Filters public taxonomies. |
| 345 |
* |
| 346 |
* @hook powered_cache_preload_taxonomies |
| 347 |
* |
| 348 |
* @param {array} $taxonomies Public taxonomies. |
| 349 |
* |
| 350 |
* @return {array} New value. |
| 351 |
* @since 1.0 |
| 352 |
*/ |
| 353 |
$taxonomies = apply_filters( 'powered_cache_preload_taxonomies', $taxonomies ); |
| 354 |
|
| 355 |
foreach ( $taxonomies as $tax ) { |
| 356 |
\PoweredCache\Utils\log( sprintf( 'Taxonomy added to queue: %s', $tax ) ); |
| 357 |
|
| 358 |
/** |
| 359 |
* Filters taxonomy offset for preload. |
| 360 |
* |
| 361 |
* @hook powered_cache_preload_public_taxonomies_offset |
| 362 |
* |
| 363 |
* @param {int} $offset Public taxonomies. |
| 364 |
* |
| 365 |
* @return {int} New value. |
| 366 |
* @since 2.0 |
| 367 |
*/ |
| 368 |
$offset = (int) apply_filters( 'powered_cache_preload_public_taxonomies_offset', 0 ); |
| 369 |
$limit = $this->preload_max_term_count(); |
| 370 |
|
| 371 |
/** |
| 372 |
* Filters term query args. |
| 373 |
* |
| 374 |
* @hook powered_cache_preload_tax_term_args |
| 375 |
* |
| 376 |
* @param {array} $args Arguments for terms. |
| 377 |
* |
| 378 |
* @return {array} New value. |
| 379 |
* @since 2.0 |
| 380 |
*/ |
| 381 |
$args = apply_filters( |
| 382 |
'powered_cache_preload_tax_term_args', |
| 383 |
[ |
| 384 |
'hide_empty' => false, |
| 385 |
'orderby' => 'count', |
| 386 |
'offset' => $offset, |
| 387 |
'number' => $limit, |
| 388 |
], |
| 389 |
$tax |
| 390 |
); |
| 391 |
|
| 392 |
\PoweredCache\Utils\log( 'Taxonomy preload args: [powered_cache_preload_tax_term_args]:' . print_r( $args, true ) ); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_print_r |
| 393 |
|
| 394 |
$terms = get_terms( $tax, $args ); |
| 395 |
|
| 396 |
foreach ( $terms as $term ) { |
| 397 |
$public_tax_term_urls[] = get_term_link( $term ); |
| 398 |
} |
| 399 |
} |
| 400 |
|
| 401 |
return $public_tax_term_urls; |
| 402 |
} |
| 403 |
|
| 404 |
|
| 405 |
/** |
| 406 |
* Max number of posts that will preloaded |
| 407 |
* |
| 408 |
* @return mixed|void |
| 409 |
*/ |
| 410 |
public function preload_max_post_count() { |
| 411 |
/** |
| 412 |
* Filters preload post count |
| 413 |
* |
| 414 |
* @hook powered_cache_preload_post_limit |
| 415 |
* |
| 416 |
* @param {int} $limit The number of posts that will preloaded. |
| 417 |
* |
| 418 |
* @return {int} New value. |
| 419 |
* @since 2.0 |
| 420 |
*/ |
| 421 |
return apply_filters( 'powered_cache_preload_post_limit', 1000 ); |
| 422 |
} |
| 423 |
|
| 424 |
/** |
| 425 |
* Max number of public terms that will preloaded |
| 426 |
* |
| 427 |
* @return mixed|void |
| 428 |
*/ |
| 429 |
public function preload_max_term_count() { |
| 430 |
/** |
| 431 |
* Filters preload term count |
| 432 |
* |
| 433 |
* @hook powered_cache_preload_term_limit |
| 434 |
* |
| 435 |
* @param {int} $limit The number of terms that will preloaded. |
| 436 |
* |
| 437 |
* @return {int} New value. |
| 438 |
* @since 2.0 |
| 439 |
*/ |
| 440 |
return apply_filters( 'powered_cache_preload_term_limit', 100 ); |
| 441 |
} |
| 442 |
|
| 443 |
/** |
| 444 |
* Filters domains and URLs for resource hints of relation type |
| 445 |
* |
| 446 |
* @param array $urls URLs to print for resource hints. |
| 447 |
* @param string $relation_type The relation type the URLs are printed for, e.g. 'preconnect' or 'prerender'. |
| 448 |
* |
| 449 |
* @return array $urls resource hints |
| 450 |
*/ |
| 451 |
public function dns_prefetch( $urls, $relation_type ) { |
| 452 |
$domains = $this->get_prefetch_dns(); |
| 453 |
if ( $domains && is_array( $domains ) ) { |
| 454 |
foreach ( $domains as $domain ) { |
| 455 |
if ( 'dns-prefetch' === $relation_type ) { |
| 456 |
$urls[] = $domain; |
| 457 |
} |
| 458 |
|
| 459 |
if ( 'preconnect' === $relation_type ) { |
| 460 |
$parsed = wp_parse_url( $domain ); |
| 461 |
if ( empty( $parsed['scheme'] ) ) { |
| 462 |
$domain = set_url_scheme( $domain ); |
| 463 |
} |
| 464 |
|
| 465 |
$urls[] = $domain; |
| 466 |
} |
| 467 |
} |
| 468 |
} |
| 469 |
|
| 470 |
return $urls; |
| 471 |
} |
| 472 |
|
| 473 |
|
| 474 |
/** |
| 475 |
* |
| 476 |
* Get the list of prefetch domains |
| 477 |
* |
| 478 |
* @return mixed|void |
| 479 |
*/ |
| 480 |
public function get_prefetch_dns() { |
| 481 |
$settings = \PoweredCache\Utils\get_settings(); |
| 482 |
|
| 483 |
$prefetch_dns = preg_split( '#(\r\n|\r|\n)#', $settings['prefetch_dns'], - 1, PREG_SPLIT_NO_EMPTY ); |
| 484 |
|
| 485 |
/** |
| 486 |
* Filters Prefetched DNS list. |
| 487 |
* |
| 488 |
* @hook powered_cache_prefetch_dns |
| 489 |
* |
| 490 |
* @param {array} $prefetch_dns The list of prefetch domains. |
| 491 |
* |
| 492 |
* @return {array} New value. |
| 493 |
* @since 2.0 |
| 494 |
*/ |
| 495 |
return apply_filters( 'powered_cache_prefetch_dns', $prefetch_dns ); |
| 496 |
} |
| 497 |
|
| 498 |
|
| 499 |
/** |
| 500 |
* Make preload request |
| 501 |
* |
| 502 |
* @param string $url Target URL |
| 503 |
* @param array $args request args |
| 504 |
* |
| 505 |
* @return array|\WP_Error |
| 506 |
*/ |
| 507 |
public static function preload_request( $url, $args = [] ) { |
| 508 |
|
| 509 |
/** |
| 510 |
* Filters args of preload requests. |
| 511 |
* |
| 512 |
* @hook powered_cache_preload_url_request_args |
| 513 |
* |
| 514 |
* @param {array} $args Request defaults. |
| 515 |
* |
| 516 |
* @return {array} New value. |
| 517 |
* @since 2.0 |
| 518 |
*/ |
| 519 |
$request_args = apply_filters( |
| 520 |
'powered_cache_preload_url_request_args', |
| 521 |
[ |
| 522 |
'timeout' => 0.01, |
| 523 |
'blocking' => false, |
| 524 |
'user-agent' => 'Powered Cache Preloader', |
| 525 |
'sslverify' => false, |
| 526 |
] |
| 527 |
); |
| 528 |
|
| 529 |
$args = wp_parse_args( $args, $request_args ); |
| 530 |
|
| 531 |
/** |
| 532 |
* Fires before doing preload HTTP request. |
| 533 |
* |
| 534 |
* @hook powered_cache_preload_http_request |
| 535 |
* |
| 536 |
* @param {string} $url Preload URL. |
| 537 |
* @param {array} $args Request arguments. |
| 538 |
* |
| 539 |
* @since 2.0 |
| 540 |
*/ |
| 541 |
do_action( 'powered_cache_preload_http_request', $url, $args ); |
| 542 |
|
| 543 |
\PoweredCache\Utils\log( sprintf( 'Preloading...%s: %s', $url, print_r( $args, true ) ) ); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_print_r |
| 544 |
|
| 545 |
return wp_remote_get( esc_url_raw( $url ), $args ); |
| 546 |
} |
| 547 |
|
| 548 |
/** |
| 549 |
* Wait internal between HTTP reqs |
| 550 |
* |
| 551 |
* @param int $delay delay time in microseconds |
| 552 |
*/ |
| 553 |
public static function wait( $delay = 500000 ) { |
| 554 |
/** |
| 555 |
* Filters wait time between preload requests. |
| 556 |
* |
| 557 |
* @hook powered_cache_preload_request_interval |
| 558 |
* |
| 559 |
* @param {int} $delay Delay time in milliseconds. |
| 560 |
* |
| 561 |
* @return {int} New value. |
| 562 |
* @since 2.0 |
| 563 |
*/ |
| 564 |
usleep( absint( apply_filters( 'powered_cache_preload_request_interval', $delay ) ) ); |
| 565 |
} |
| 566 |
|
| 567 |
|
| 568 |
/** |
| 569 |
* Get mobile user agent for preload requests |
| 570 |
* |
| 571 |
* @return mixed|void |
| 572 |
*/ |
| 573 |
public static function mobile_user_agent() { |
| 574 |
/** |
| 575 |
* Filters mobile agent name for mobile preload requests |
| 576 |
* |
| 577 |
* @hook powered_cache_preload_mobile_user_agent |
| 578 |
* |
| 579 |
* @param {string} $agent Mobile agent name. |
| 580 |
* |
| 581 |
* @return {string} New value. |
| 582 |
* @since 2.0 |
| 583 |
*/ |
| 584 |
return apply_filters( 'powered_cache_preload_mobile_user_agent', 'Powered Cache Preloader mobile iPhone' ); |
| 585 |
} |
| 586 |
|
| 587 |
} |
| 588 |
|
