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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 468 | |
| 469 | /** |
| 470 | * Filters whether to get the cache of the registered theme directories. |
| 471 | * |
| 472 | * @since 3.4.0 |
| 473 | * |
| 474 | * @param bool $cache_expiration Whether to get the cache of the theme directories. Default false. |
| 475 | * @param string $context The class or function name calling the filter. |
| 476 | */ |
| 477 | $cache_expiration = apply_filters( 'wp_cache_themes_persistently', false, 'search_theme_directories' ); |
| 478 | |
| 479 | if ( $cache_expiration ) { |
| 480 | $cached_roots = get_site_transient( 'theme_roots' ); |
| 481 | if ( is_array( $cached_roots ) ) { |
| 482 | foreach ( $cached_roots as $theme_dir => $theme_root ) { |
| 483 | // A cached theme root is no longer around, so skip it. |
| 484 | if ( ! isset( $relative_theme_roots[ $theme_root ] ) ) { |
| 485 | continue; |
| 486 | } |