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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 |
|---|---|
| 19 | * @see WP_Scripts::do_items() |
| 20 | * @global WP_Scripts $wp_scripts The WP_Scripts object for printing scripts. |
| 21 | * |
| 22 | * @since 2.6.0 |
| 23 | * |
| 24 | * @param array|bool $handles Optional. Scripts to be printed. Default 'false'. |
| 25 | * @return array On success, a processed array of WP_Dependencies items; otherwise, an empty array. |
| 26 | */ |
| 27 | function wp_print_scripts( $handles = false ) { |
| 28 | do_action( 'wp_print_scripts' ); |
| 29 | if ( '' === $handles ) // for wp_head |
| 30 | $handles = false; |
| 31 | |
| 32 | global $wp_scripts; |
| 33 | if ( ! is_a( $wp_scripts, 'WP_Scripts' ) ) { |
| 34 | if ( ! did_action( 'init' ) ) |
| 35 | _doing_it_wrong( __FUNCTION__, sprintf( __( 'Scripts and styles should not be registered or enqueued until the %1$s, %2$s, or %3$s hooks.' ), |
| 36 | '<code>wp_enqueue_scripts</code>', '<code>admin_enqueue_scripts</code>', '<code>login_enqueue_scripts</code>' ), '3.3' ); |
| 37 | |