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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.
| Line | Code |
|---|---|
| 13 | * on every page load, the function does not instantiate the WP_Scripts object |
| 14 | * unless script names are explicitly passed. Does make use of already |
| 15 | * instantiated $wp_scripts if present. Use provided wp_print_scripts hook to |
| 16 | * register/enqueue new scripts. |
| 17 | * |
| 18 | * @since r16 |
| 19 | * @see WP_Scripts::print_scripts() |
| 20 | */ |
| 21 | function wp_print_scripts( $handles = false ) { |
| 22 | do_action( 'wp_print_scripts' ); |
| 23 | if ( '' === $handles ) // for wp_head |
| 24 | $handles = false; |
| 25 | |
| 26 | global $wp_scripts; |
| 27 | if ( !is_a($wp_scripts, 'WP_Scripts') ) { |
| 28 | if ( !$handles ) |
| 29 | return array(); // No need to instantiate if nothing's there. |
| 30 | else |
| 31 | $wp_scripts = new WP_Scripts(); |