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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 |
|---|---|
| 211 | * @param string $theme_root Theme root. |
| 212 | * @param WP_Theme|null $_child If this theme is a parent theme, the child may be passed for validation purposes. |
| 213 | */ |
| 214 | public function __construct( $theme_dir, $theme_root, $_child = null ) { |
| 215 | global $wp_theme_directories; |
| 216 | |
| 217 | // Initialize caching on first run. |
| 218 | if ( ! isset( self::$persistently_cache ) ) { |
| 219 | /** This action is documented in wp-includes/theme.php */ |
| 220 | self::$persistently_cache = apply_filters( 'wp_cache_themes_persistently', false, 'WP_Theme' ); |
| 221 | if ( self::$persistently_cache ) { |
| 222 | wp_cache_add_global_groups( 'themes' ); |
| 223 | if ( is_int( self::$persistently_cache ) ) { |
| 224 | self::$cache_expiration = self::$persistently_cache; |
| 225 | } |
| 226 | } else { |
| 227 | wp_cache_add_non_persistent_groups( 'themes' ); |
| 228 | } |
| 229 | } |