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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 |
---|---|
2118 | * @global bool $concatenate_scripts |
2119 | * |
2120 | * @return array |
2121 | */ |
2122 | function print_head_scripts() { |
2123 | global $concatenate_scripts; |
2124 |
|
2125 | if ( ! did_action( 'wp_print_scripts' ) ) { |
2126 | /** This action is documented in wp-includes/functions.wp-scripts.php */ |
2127 | do_action( 'wp_print_scripts' ); |
2128 | } |
2129 |
|
2130 | $wp_scripts = wp_scripts(); |
2131 |
|
2132 | script_concat_settings(); |
2133 | $wp_scripts->do_concat = $concatenate_scripts; |
2134 | $wp_scripts->do_head_items(); |
2135 |
|
2136 | /** |
Line | Code |
2236 | * @since 2.8.0 |
2237 | * |
2238 | * @global WP_Scripts $wp_scripts |
2239 | * |
2240 | * @return array |
2241 | */ |
2242 | function wp_print_head_scripts() { |
2243 | if ( ! did_action( 'wp_print_scripts' ) ) { |
2244 | /** This action is documented in wp-includes/functions.wp-scripts.php */ |
2245 | do_action( 'wp_print_scripts' ); |
2246 | } |
2247 |
|
2248 | global $wp_scripts; |
2249 |
|
2250 | if ( ! ( $wp_scripts instanceof WP_Scripts ) ) { |
2251 | return array(); // No need to run if nothing is queued. |
2252 | } |
2253 | return print_head_scripts(); |
2254 | } |