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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 |
|---|---|
| 680 | * print_footer_scripts() is called in the footer to print these scripts. |
| 681 | * |
| 682 | * @since 2.8 |
| 683 | * @see wp_print_scripts() |
| 684 | */ |
| 685 | function print_head_scripts() { |
| 686 | global $wp_scripts, $concatenate_scripts; |
| 687 | |
| 688 | if ( ! did_action('wp_print_scripts') ) |
| 689 | do_action('wp_print_scripts'); |
| 690 | |
| 691 | if ( !is_a($wp_scripts, 'WP_Scripts') ) |
| 692 | $wp_scripts = new WP_Scripts(); |
| 693 | |
| 694 | script_concat_settings(); |
| 695 | $wp_scripts->do_concat = $concatenate_scripts; |
| 696 | $wp_scripts->do_head_items(); |
| 697 | |
| 698 | if ( apply_filters('print_head_scripts', true) ) |
| Line | Code |
| 759 | * Prints the script queue in the HTML head on the front end. |
| 760 | * |
| 761 | * Postpones the scripts that were queued for the footer. |
| 762 | * wp_print_footer_scripts() is called in the footer to print these scripts. |
| 763 | * |
| 764 | * @since 2.8 |
| 765 | */ |
| 766 | function wp_print_head_scripts() { |
| 767 | if ( ! did_action('wp_print_scripts') ) |
| 768 | do_action('wp_print_scripts'); |
| 769 | |
| 770 | global $wp_scripts; |
| 771 | |
| 772 | if ( !is_a($wp_scripts, 'WP_Scripts') ) |
| 773 | return array(); // no need to run if nothing is queued |
| 774 | |
| 775 | return print_head_scripts(); |
| 776 | } |
| 777 | |