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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 |
|---|---|
| 571 | * print_footer_scripts() is called in the footer to print these scripts. |
| 572 | * |
| 573 | * @since 2.8 |
| 574 | * @see wp_print_scripts() |
| 575 | */ |
| 576 | function print_head_scripts() { |
| 577 | global $wp_scripts, $concatenate_scripts; |
| 578 | |
| 579 | if ( ! did_action('wp_print_scripts') ) |
| 580 | do_action('wp_print_scripts'); |
| 581 | |
| 582 | if ( !is_a($wp_scripts, 'WP_Scripts') ) |
| 583 | $wp_scripts = new WP_Scripts(); |
| 584 | |
| 585 | script_concat_settings(); |
| 586 | $wp_scripts->do_concat = $concatenate_scripts; |
| 587 | $wp_scripts->do_head_items(); |
| 588 | |
| 589 | if ( apply_filters('print_head_scripts', true) ) |
| Line | Code |
| 648 | * Prints the script queue in the HTML head on the front end. |
| 649 | * |
| 650 | * Postpones the scripts that were queued for the footer. |
| 651 | * wp_print_footer_scripts() is called in the footer to print these scripts. |
| 652 | * |
| 653 | * @since 2.8 |
| 654 | */ |
| 655 | function wp_print_head_scripts() { |
| 656 | if ( ! did_action('wp_print_scripts') ) |
| 657 | do_action('wp_print_scripts'); |
| 658 | |
| 659 | global $wp_scripts; |
| 660 | |
| 661 | if ( !is_a($wp_scripts, 'WP_Scripts') ) |
| 662 | return array(); // no need to run if nothing is queued |
| 663 | |
| 664 | return print_head_scripts(); |
| 665 | } |
| 666 | |