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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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181 | * @param string $theme_root Theme root. |
182 | * @param WP_Error|void $_child If this theme is a parent theme, the child may be passed for validation purposes. |
183 | */ |
184 | public function __construct( $theme_dir, $theme_root, $_child = null ) { |
185 | global $wp_theme_directories; |
186 |
|
187 | // Initialize caching on first run. |
188 | if ( ! isset( self::$persistently_cache ) ) { |
189 | /** This action is documented in wp-includes/theme.php */ |
190 | self::$persistently_cache = apply_filters( 'wp_cache_themes_persistently', false, 'WP_Theme' ); |
191 | if ( self::$persistently_cache ) { |
192 | wp_cache_add_global_groups( 'themes' ); |
193 | if ( is_int( self::$persistently_cache ) ) { |
194 | self::$cache_expiration = self::$persistently_cache; |
195 | } |
196 | } else { |
197 | wp_cache_add_non_persistent_groups( 'themes' ); |
198 | } |
199 | } |