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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 |
|---|---|
| 592 | * print_footer_scripts() is called in the footer to print these scripts. |
| 593 | * |
| 594 | * @since 2.8 |
| 595 | * @see wp_print_scripts() |
| 596 | */ |
| 597 | function print_head_scripts() { |
| 598 | global $wp_scripts, $concatenate_scripts; |
| 599 | |
| 600 | if ( ! did_action('wp_print_scripts') ) |
| 601 | do_action('wp_print_scripts'); |
| 602 | |
| 603 | if ( !is_a($wp_scripts, 'WP_Scripts') ) |
| 604 | $wp_scripts = new WP_Scripts(); |
| 605 | |
| 606 | script_concat_settings(); |
| 607 | $wp_scripts->do_concat = $concatenate_scripts; |
| 608 | $wp_scripts->do_head_items(); |
| 609 | |
| 610 | if ( apply_filters('print_head_scripts', true) ) |
| Line | Code |
| 668 | * Prints the script queue in the HTML head on the front end. |
| 669 | * |
| 670 | * Postpones the scripts that were queued for the footer. |
| 671 | * wp_print_footer_scripts() is called in the footer to print these scripts. |
| 672 | * |
| 673 | * @since 2.8 |
| 674 | */ |
| 675 | function wp_print_head_scripts() { |
| 676 | if ( ! did_action('wp_print_scripts') ) |
| 677 | do_action('wp_print_scripts'); |
| 678 | |
| 679 | global $wp_scripts; |
| 680 | |
| 681 | if ( !is_a($wp_scripts, 'WP_Scripts') ) |
| 682 | return array(); // no need to run if nothing is queued |
| 683 | |
| 684 | return print_head_scripts(); |
| 685 | } |
| 686 | |