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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 | 
|---|---|
| 961 |  * | 
| 962 |  * @since 2.8.0 | 
| 963 |  */ | 
| 964 | function wp_enqueue_scripts() { | 
| 965 |      /** | 
| 966 |       * Fires when scripts and styles are enqueued. | 
| 967 |       * | 
| 968 |       * @since 2.8.0 | 
| 969 |       */ | 
| 970 |      do_action( 'wp_enqueue_scripts' ); | 
| 971 | } | 
| 972 |  | 
| 973 | /** | 
| 974 |  * Prints the styles queue in the HTML head on admin pages. | 
| 975 |  * | 
| 976 |  * @since 2.8.0 | 
| 977 |  */ | 
| 978 | function print_admin_styles() { | 
| 979 |      global $wp_styles, $concatenate_scripts; |