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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 | 
|---|---|
| 2023 |      $wp_styles->do_items( false ); | 
| 2024 |  | 
| 2025 |      /** | 
| 2026 |       * Filters whether to print the admin styles. | 
| 2027 |       * | 
| 2028 |       * @since 2.8.0 | 
| 2029 |       * | 
| 2030 |       * @param bool $print Whether to print the admin styles. Default true. | 
| 2031 |       */ | 
| 2032 |      if ( apply_filters( 'print_admin_styles', true ) ) { | 
| 2033 |           _print_styles(); | 
| 2034 |      } | 
| 2035 |  | 
| 2036 |      $wp_styles->reset(); | 
| 2037 |      return $wp_styles->done; | 
| 2038 | } | 
| 2039 |  | 
| 2040 | /** | 
| 2041 |  * Prints the styles that were queued too late for the HTML head. |