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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 |
---|---|
812 | * @since 2.8.0 |
813 | * |
814 | * @see wp_print_scripts() |
815 | */ |
816 | function print_head_scripts() { |
817 | global $wp_scripts, $concatenate_scripts; |
818 |
|
819 | if ( ! did_action('wp_print_scripts') ) { |
820 | /** This action is documented in wp-includes/functions.wp-scripts.php */ |
821 | do_action( 'wp_print_scripts' ); |
822 | } |
823 |
|
824 | if ( ! ( $wp_scripts instanceof WP_Scripts ) ) { |
825 | $wp_scripts = new WP_Scripts(); |
826 | } |
827 |
|
828 | script_concat_settings(); |
829 | $wp_scripts->do_concat = $concatenate_scripts; |
830 | $wp_scripts->do_head_items(); |
Line | Code |
912 | * |
913 | * Postpones the scripts that were queued for the footer. |
914 | * wp_print_footer_scripts() is called in the footer to print these scripts. |
915 | * |
916 | * @since 2.8.0 |
917 | */ |
918 | function wp_print_head_scripts() { |
919 | if ( ! did_action('wp_print_scripts') ) { |
920 | /** This action is documented in wp-includes/functions.wp-scripts.php */ |
921 | do_action( 'wp_print_scripts' ); |
922 | } |
923 |
|
924 | global $wp_scripts; |
925 |
|
926 | if ( ! ( $wp_scripts instanceof WP_Scripts ) ) { |
927 | return array(); // no need to run if nothing is queued |
928 | } |
929 | return print_head_scripts(); |
930 | } |