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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 |
|---|---|
| 1145 | |
| 1146 | if ( 'description' == $field ) |
| 1147 | $value = esc_html( $value ); // textarea_escaped? |
| 1148 | else |
| 1149 | $value = esc_attr($value); |
| 1150 | } else if ( 'db' == $context ) { |
| 1151 | if ( $prefixed ) { |
| 1152 | $value = apply_filters("pre_{$field}", $value); |
| 1153 | } else { |
| 1154 | $value = apply_filters("pre_user_{$field}", $value); |
| 1155 | } |
| 1156 | } else { |
| 1157 | // Use display filters by default. |
| 1158 | if ( $prefixed ) |
| 1159 | $value = apply_filters($field, $value, $user_id, $context); |
| 1160 | else |
| 1161 | $value = apply_filters("user_{$field}", $value, $user_id, $context); |
| 1162 | } |
| 1163 | |