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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 |
|---|---|
| 11 | * |
| 12 | * @since r79 |
| 13 | * @uses do_action() Calls 'wp_print_styles' hook. |
| 14 | * @global object $wp_styles The WP_Styles object for printing styles. |
| 15 | * |
| 16 | * @param array $handles (optional) Styles to be printed. (void) prints queue, (string) prints that style, (array of strings) prints those styles. |
| 17 | * @return bool True on success, false on failure. |
| 18 | */ |
| 19 | function wp_print_styles( $handles = false ) { |
| 20 | do_action( 'wp_print_styles' ); |
| 21 | if ( '' === $handles ) // for wp_head |
| 22 | $handles = false; |
| 23 | |
| 24 | global $wp_styles; |
| 25 | if ( !is_a($wp_styles, 'WP_Styles') ) { |
| 26 | if ( !$handles ) |
| 27 | return array(); // No need to instantiate if nothing's there. |
| 28 | else |
| 29 | $wp_styles = new WP_Styles(); |