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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 7 times in this file.
| Line | Code |
|---|---|
| 855 | if ( is_array( $context ) ) { |
| 856 | /** |
| 857 | * Filters the HTML that is allowed for a given context. |
| 858 | * |
| 859 | * @since 3.5.0 |
| 860 | * |
| 861 | * @param array[]|string $context Context to judge allowed tags by. |
| 862 | * @param string $context_type Context name. |
| 863 | */ |
| 864 | return apply_filters( 'wp_kses_allowed_html', $context, 'explicit' ); |
| 865 | } |
| 866 | |
| 867 | switch ( $context ) { |
| 868 | case 'post': |
| 869 | /** This filter is documented in wp-includes/kses.php */ |
| 870 | $tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context ); |
| 871 | |
| 872 | // 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`. |
| 873 | if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) || isset( $tags['select'] ) ) ) { |
| 874 | $tags = $allowedposttags; |
| 875 | |
| 876 | $tags['form'] = array( |
| 877 | 'action' => true, |
| 878 | 'accept' => true, |
| 879 | 'accept-charset' => true, |
| 880 | 'enctype' => true, |
| 881 | 'method' => true, |
| 882 | 'name' => true, |
| 883 | 'target' => true, |
| 884 | ); |
| 885 | |
| 886 | /** This filter is documented in wp-includes/kses.php */ |
| 887 | $tags = apply_filters( 'wp_kses_allowed_html', $tags, $context ); |
| 888 | } |
| 889 | |
| 890 | return $tags; |
| 891 | |
| 892 | case 'user_description': |
| 893 | case 'pre_user_description': |
| 894 | $tags = $allowedtags; |
| 895 | $tags['a']['rel'] = true; |
| 896 | /** This filter is documented in wp-includes/kses.php */ |
| 897 | return apply_filters( 'wp_kses_allowed_html', $tags, $context ); |
| 898 | |
| 899 | case 'strip': |
| 900 | /** This filter is documented in wp-includes/kses.php */ |
| 901 | return apply_filters( 'wp_kses_allowed_html', array(), $context ); |
| 902 | |
| 903 | case 'entities': |
| 904 | /** This filter is documented in wp-includes/kses.php */ |
| 905 | return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context ); |
| 906 | |
| 907 | case 'data': |
| 908 | default: |
| 909 | /** This filter is documented in wp-includes/kses.php */ |
| 910 | return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context ); |
| 911 | } |
| 912 | } |
| 913 | |
| 914 | /** |
| 915 | * You add any KSES hooks here. |
| 916 | * |
| 917 | * There is currently only one KSES WordPress hook, {@see 'pre_kses'}, and it is called here. |
| 918 | * All parameters are passed to the hooks and expected to receive a string. |
| 919 | * |