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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 |
|---|---|
| 412 | |
| 413 | /** |
| 414 | * Filter whether to get the cache of the registered theme directories. |
| 415 | * |
| 416 | * @since 3.4.0 |
| 417 | * |
| 418 | * @param bool $cache_expiration Whether to get the cache of the theme directories. Default false. |
| 419 | * @param string $cache_directory Directory to be searched for the cache. |
| 420 | */ |
| 421 | if ( $cache_expiration = apply_filters( 'wp_cache_themes_persistently', false, 'search_theme_directories' ) ) { |
| 422 | $cached_roots = get_site_transient( 'theme_roots' ); |
| 423 | if ( is_array( $cached_roots ) ) { |
| 424 | foreach ( $cached_roots as $theme_dir => $theme_root ) { |
| 425 | // A cached theme root is no longer around, so skip it. |
| 426 | if ( ! isset( $relative_theme_roots[ $theme_root ] ) ) |
| 427 | continue; |
| 428 | $found_themes[ $theme_dir ] = array( |
| 429 | 'theme_file' => $theme_dir . '/style.css', |
| 430 | 'theme_root' => $relative_theme_roots[ $theme_root ], // Convert relative to absolute. |