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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 |
---|---|
225 | * @param string $theme_root Theme root. |
226 | * @param WP_Theme|null $_child If this theme is a parent theme, the child may be passed for validation purposes. |
227 | */ |
228 | public function __construct( $theme_dir, $theme_root, $_child = null ) { |
229 | global $wp_theme_directories; |
230 |
|
231 | // Initialize caching on first run. |
232 | if ( ! isset( self::$persistently_cache ) ) { |
233 | /** This action is documented in wp-includes/theme.php */ |
234 | self::$persistently_cache = apply_filters( 'wp_cache_themes_persistently', false, 'WP_Theme' ); |
235 | if ( self::$persistently_cache ) { |
236 | wp_cache_add_global_groups( 'themes' ); |
237 | if ( is_int( self::$persistently_cache ) ) { |
238 | self::$cache_expiration = self::$persistently_cache; |
239 | } |
240 | } else { |
241 | wp_cache_add_non_persistent_groups( 'themes' ); |
242 | } |
243 | } |