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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 |
|---|---|
| 1071 | * HTML tags and attribute names are case-insensitive in HTML but must be |
| 1072 | * added to the KSES allow list in lowercase. An item added to the allow list |
| 1073 | * in upper or mixed case will not recognized as permitted by KSES. |
| 1074 | * |
| 1075 | * @since 3.5.0 |
| 1076 | * |
| 1077 | * @param array[] $html Allowed HTML tags. |
| 1078 | * @param string $context Context name. |
| 1079 | */ |
| 1080 | return apply_filters( 'wp_kses_allowed_html', $html, $context ); |
| 1081 | } |
| 1082 | |
| 1083 | switch ( $context ) { |
| 1084 | case 'post': |
| 1085 | /** This filter is documented in wp-includes/kses.php */ |
| 1086 | $tags = apply_filters( 'wp_kses_allowed_html', $allowedposttags, $context ); |
| 1087 | |
| 1088 | // 5.0.1 removed the `<form>` tag, allow it if a filter is allowing it's sub-elements `<input>` or `<select>`. |
| 1089 | if ( ! CUSTOM_TAGS && ! isset( $tags['form'] ) && ( isset( $tags['input'] ) || isset( $tags['select'] ) ) ) { |
| 1090 | $tags = $allowedposttags; |
| 1091 | |
| 1092 | $tags['form'] = array( |
| 1093 | 'action' => true, |
| 1094 | 'accept' => true, |
| 1095 | 'accept-charset' => true, |
| 1096 | 'enctype' => true, |
| 1097 | 'method' => true, |
| 1098 | 'name' => true, |
| 1099 | 'target' => true, |
| 1100 | ); |
| 1101 | |
| 1102 | /** This filter is documented in wp-includes/kses.php */ |
| 1103 | $tags = apply_filters( 'wp_kses_allowed_html', $tags, $context ); |
| 1104 | } |
| 1105 | |
| 1106 | return $tags; |
| 1107 | |
| 1108 | case 'user_description': |
| 1109 | case 'pre_term_description': |
| 1110 | case 'pre_user_description': |
| 1111 | $tags = $allowedtags; |
| 1112 | $tags['a']['rel'] = true; |
| 1113 | $tags['a']['target'] = true; |
| 1114 | /** This filter is documented in wp-includes/kses.php */ |
| 1115 | return apply_filters( 'wp_kses_allowed_html', $tags, $context ); |
| 1116 | |
| 1117 | case 'strip': |
| 1118 | /** This filter is documented in wp-includes/kses.php */ |
| 1119 | return apply_filters( 'wp_kses_allowed_html', array(), $context ); |
| 1120 | |
| 1121 | case 'entities': |
| 1122 | /** This filter is documented in wp-includes/kses.php */ |
| 1123 | return apply_filters( 'wp_kses_allowed_html', $allowedentitynames, $context ); |
| 1124 | |
| 1125 | case 'data': |
| 1126 | default: |
| 1127 | /** This filter is documented in wp-includes/kses.php */ |
| 1128 | return apply_filters( 'wp_kses_allowed_html', $allowedtags, $context ); |
| 1129 | } |
| 1130 | } |
| 1131 | |
| 1132 | /** |
| 1133 | * You add any KSES hooks here. |
| 1134 | * |
| 1135 | * There is currently only one KSES WordPress hook, {@see 'pre_kses'}, and it is called here. |
| 1136 | * All parameters are passed to the hooks and expected to receive a string. |
| 1137 | * |