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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 |
|---|---|
| 67 | * @param string|bool|array $handles Optional. Scripts to be printed. Default 'false'. |
| 68 | * @return string[] On success, an array of handles of processed WP_Dependencies items; otherwise, an empty array. |
| 69 | */ |
| 70 | function wp_print_scripts( $handles = false ) { |
| 71 | /** |
| 72 | * Fires before scripts in the $handles queue are printed. |
| 73 | * |
| 74 | * @since 2.1.0 |
| 75 | */ |
| 76 | do_action( 'wp_print_scripts' ); |
| 77 | if ( '' === $handles ) { // For 'wp_head'. |
| 78 | $handles = false; |
| 79 | } |
| 80 | |
| 81 | _wp_scripts_maybe_doing_it_wrong( __FUNCTION__ ); |
| 82 | |
| 83 | global $wp_scripts; |
| 84 | if ( ! ( $wp_scripts instanceof WP_Scripts ) ) { |
| 85 | if ( ! $handles ) { |