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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 |
|---|---|
| 2224 | $meta_key = preg_replace('|[^a-z0-9_]|i', '', $meta_key); |
| 2225 | |
| 2226 | if ( is_array($meta_value) || is_object($meta_value) ) |
| 2227 | $meta_value = serialize($meta_value); |
| 2228 | $meta_value = trim( $meta_value ); |
| 2229 | |
| 2230 | $cur = $wpdb->get_row( $wpdb->prepare("SELECT * FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) ); |
| 2231 | |
| 2232 | if ( $cur && $cur->umeta_id ) |
| 2233 | do_action( 'delete_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value ); |
| 2234 | |
| 2235 | if ( ! empty($meta_value) ) |
| 2236 | $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s AND meta_value = %s", $user_id, $meta_key, $meta_value) ); |
| 2237 | else |
| 2238 | $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) ); |
| 2239 | |
| 2240 | clean_user_cache( $user_id ); |
| 2241 | wp_cache_delete( $user_id, 'user_meta' ); |
| 2242 | |