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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 | 
|---|---|
| 1413 |      } | 
| 1414 |  | 
| 1415 |      /** | 
| 1416 |       * Filters the header video URL. | 
| 1417 |       * | 
| 1418 |       * @since 4.7.3 | 
| 1419 |       * | 
| 1420 |       * @param string $url Header video URL, if available. | 
| 1421 |       */ | 
| 1422 |      $url = apply_filters( 'get_header_video_url', $url ); | 
| 1423 |  | 
| 1424 |      if ( ! $id && ! $url ) { | 
| 1425 |           return false; | 
| 1426 |      } | 
| 1427 |  | 
| 1428 |      return esc_url_raw( set_url_scheme( $url ) ); | 
| 1429 | } | 
| 1430 |  | 
| 1431 | /** |