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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 635 | * print_footer_scripts() is called in the footer to print these scripts. |
| 636 | * |
| 637 | * @since 2.8 |
| 638 | * @see wp_print_scripts() |
| 639 | */ |
| 640 | function print_head_scripts() { |
| 641 | global $wp_scripts, $concatenate_scripts; |
| 642 | |
| 643 | if ( ! did_action('wp_print_scripts') ) |
| 644 | do_action('wp_print_scripts'); |
| 645 | |
| 646 | if ( !is_a($wp_scripts, 'WP_Scripts') ) |
| 647 | $wp_scripts = new WP_Scripts(); |
| 648 | |
| 649 | script_concat_settings(); |
| 650 | $wp_scripts->do_concat = $concatenate_scripts; |
| 651 | $wp_scripts->do_head_items(); |
| 652 | |
| 653 | if ( apply_filters('print_head_scripts', true) ) |
| Line | Code |
| 714 | * Prints the script queue in the HTML head on the front end. |
| 715 | * |
| 716 | * Postpones the scripts that were queued for the footer. |
| 717 | * wp_print_footer_scripts() is called in the footer to print these scripts. |
| 718 | * |
| 719 | * @since 2.8 |
| 720 | */ |
| 721 | function wp_print_head_scripts() { |
| 722 | if ( ! did_action('wp_print_scripts') ) |
| 723 | do_action('wp_print_scripts'); |
| 724 | |
| 725 | global $wp_scripts; |
| 726 | |
| 727 | if ( !is_a($wp_scripts, 'WP_Scripts') ) |
| 728 | return array(); // no need to run if nothing is queued |
| 729 | |
| 730 | return print_head_scripts(); |
| 731 | } |
| 732 | |