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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 |
|---|---|
| 180 | * @param string $theme_root Theme root. |
| 181 | * @param WP_Error|void $_child If this theme is a parent theme, the child may be passed for validation purposes. |
| 182 | */ |
| 183 | public function __construct( $theme_dir, $theme_root, $_child = null ) { |
| 184 | global $wp_theme_directories; |
| 185 | |
| 186 | // Initialize caching on first run. |
| 187 | if ( ! isset( self::$persistently_cache ) ) { |
| 188 | /** This action is documented in wp-includes/theme.php */ |
| 189 | self::$persistently_cache = apply_filters( 'wp_cache_themes_persistently', false, 'WP_Theme' ); |
| 190 | if ( self::$persistently_cache ) { |
| 191 | wp_cache_add_global_groups( 'themes' ); |
| 192 | if ( is_int( self::$persistently_cache ) ) { |
| 193 | self::$cache_expiration = self::$persistently_cache; |
| 194 | } |
| 195 | } else { |
| 196 | wp_cache_add_non_persistent_groups( 'themes' ); |
| 197 | } |
| 198 | } |