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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 |
|---|---|
| 342 | // We always want to return absolute, but we need to cache relative |
| 343 | // use in for get_theme_root(). |
| 344 | foreach ( $wp_theme_directories as $theme_root ) { |
| 345 | if ( 0 === strpos( $theme_root, WP_CONTENT_DIR ) ) |
| 346 | $relative_theme_roots[ str_replace( WP_CONTENT_DIR, '', $theme_root ) ] = $theme_root; |
| 347 | else |
| 348 | $relative_theme_roots[ $theme_root ] = $theme_root; |
| 349 | } |
| 350 | |
| 351 | if ( $cache_expiration = apply_filters( 'wp_cache_themes_persistently', false, 'search_theme_directories' ) ) { |
| 352 | $cached_roots = get_site_transient( 'theme_roots' ); |
| 353 | if ( is_array( $cached_roots ) ) { |
| 354 | foreach ( $cached_roots as $theme_dir => $theme_root ) { |
| 355 | // A cached theme root is no longer around, so skip it. |
| 356 | if ( ! isset( $relative_theme_roots[ $theme_root ] ) ) |
| 357 | continue; |
| 358 | $found_themes[ $theme_dir ] = array( |
| 359 | 'theme_file' => $theme_dir . '/style.css', |
| 360 | 'theme_root' => $relative_theme_roots[ $theme_root ], // Convert relative to absolute. |