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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 |
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185 | * @param string $theme_root Theme root. |
186 | * @param WP_Theme|null $_child If this theme is a parent theme, the child may be passed for validation purposes. |
187 | */ |
188 | public function __construct( $theme_dir, $theme_root, $_child = null ) { |
189 | global $wp_theme_directories; |
190 |
|
191 | // Initialize caching on first run. |
192 | if ( ! isset( self::$persistently_cache ) ) { |
193 | /** This action is documented in wp-includes/theme.php */ |
194 | self::$persistently_cache = apply_filters( 'wp_cache_themes_persistently', false, 'WP_Theme' ); |
195 | if ( self::$persistently_cache ) { |
196 | wp_cache_add_global_groups( 'themes' ); |
197 | if ( is_int( self::$persistently_cache ) ) { |
198 | self::$cache_expiration = self::$persistently_cache; |
199 | } |
200 | } else { |
201 | wp_cache_add_non_persistent_groups( 'themes' ); |
202 | } |
203 | } |