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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 |
---|---|
717 | * @since 2.8 |
718 | * |
719 | * @see wp_print_scripts() |
720 | */ |
721 | function print_head_scripts() { |
722 | global $wp_scripts, $concatenate_scripts; |
723 |
|
724 | if ( ! did_action('wp_print_scripts') ) { |
725 | /** This action is documented in wp-includes/functions.wp-scripts.php */ |
726 | do_action( 'wp_print_scripts' ); |
727 | } |
728 |
|
729 | if ( !is_a($wp_scripts, 'WP_Scripts') ) |
730 | $wp_scripts = new WP_Scripts(); |
731 |
|
732 | script_concat_settings(); |
733 | $wp_scripts->do_concat = $concatenate_scripts; |
734 | $wp_scripts->do_head_items(); |
735 |
|
Line | Code |
798 | * |
799 | * Postpones the scripts that were queued for the footer. |
800 | * wp_print_footer_scripts() is called in the footer to print these scripts. |
801 | * |
802 | * @since 2.8 |
803 | */ |
804 | function wp_print_head_scripts() { |
805 | if ( ! did_action('wp_print_scripts') ) { |
806 | /** This action is documented in wp-includes/functions.wp-scripts.php */ |
807 | do_action( 'wp_print_scripts' ); |
808 | } |
809 |
|
810 | global $wp_scripts; |
811 |
|
812 | if ( !is_a($wp_scripts, 'WP_Scripts') ) |
813 | return array(); // no need to run if nothing is queued |
814 |
|
815 | return print_head_scripts(); |
816 | } |