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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 6 times in this file.
| Line | Code | 
|---|---|
| 629 |      if ( is_array( $context ) ) { | 
| 630 |           /** | 
| 631 |            * Filters HTML elements allowed for a given context. | 
| 632 |            * | 
| 633 |            * @since 3.5.0 | 
| 634 |            * | 
| 635 |            * @param array  $context      Context to judge allowed tags by. | 
| 636 |            * @param string $context_type Context type (explicit). | 
| 637 |            */ | 
| 638 |           return apply_filters( 'wp_kses_allowed_html', $context, 'explicit' ); | 
| 639 |      } | 
| 640 |  | 
| 641 |      switch ( $context ) { | 
| 642 |           case 'post': | 
| 643 |                /** This filter is documented in wp-includes/kses.php */ | 
| 644 |                return apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context ); | 
| 645 |  | 
| 646 |           case 'user_description': | 
| 647 |           case 'pre_user_description': | 
| 648 |                $tags = $allowedtags; | 
| 649 |                $tags['a']['rel'] = true; | 
| 650 |                /** This filter is documented in wp-includes/kses.php */ | 
| 651 |                return apply_filters( 'wp_kses_allowed_html', $tags, $context ); | 
| 652 |  | 
| 653 |           case 'strip': | 
| 654 |                /** This filter is documented in wp-includes/kses.php */ | 
| 655 |                return apply_filters( 'wp_kses_allowed_html', array(), $context ); | 
| 656 |  | 
| 657 |           case 'entities': | 
| 658 |                /** This filter is documented in wp-includes/kses.php */ | 
| 659 |                return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context); | 
| 660 |  | 
| 661 |           case 'data': | 
| 662 |           default: | 
| 663 |                /** This filter is documented in wp-includes/kses.php */ | 
| 664 |                return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context ); | 
| 665 |      } | 
| 666 | } | 
| 667 |  | 
| 668 | /** | 
| 669 |  * You add any kses hooks here. | 
| 670 |  * | 
| 671 |  * There is currently only one kses WordPress hook, {@see 'pre_kses'}, and it is called here. | 
| 672 |  * All parameters are passed to the hooks and expected to receive a string. | 
| 673 |  * |