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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 | 
|---|---|
| 1315 |      $wp_styles->do_items(false); | 
| 1316 |  | 
| 1317 |      /** | 
| 1318 |       * Filters whether to print the admin styles. | 
| 1319 |       * | 
| 1320 |       * @since 2.8.0 | 
| 1321 |       * | 
| 1322 |       * @param bool $print Whether to print the admin styles. Default true. | 
| 1323 |       */ | 
| 1324 |      if ( apply_filters( 'print_admin_styles', true ) ) { | 
| 1325 |           _print_styles(); | 
| 1326 |      } | 
| 1327 |  | 
| 1328 |      $wp_styles->reset(); | 
| 1329 |      return $wp_styles->done; | 
| 1330 | } | 
| 1331 |  | 
| 1332 | /** | 
| 1333 |  * Prints the styles that were queued too late for the HTML head. |