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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 |
|---|---|
| 2297 | if ( ! empty($meta_value) ) |
| 2298 | $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) ); |
| 2299 | else |
| 2300 | $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) ); |
| 2301 | |
| 2302 | clean_user_cache( $user_id ); |
| 2303 | wp_cache_delete( $user_id, 'user_meta' ); |
| 2304 | |
| 2305 | if ( $cur && $cur->umeta_id ) |
| 2306 | do_action( 'deleted_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value ); |
| 2307 | |
| 2308 | return true; |
| 2309 | } |
| 2310 | |
| 2311 | /** |
| 2312 | * Retrieve user metadata. |
| 2313 | * |
| 2314 | * If $user_id is not a number, then the function will fail over with a 'false' |
| 2315 | * boolean return value. Other returned values depend on whether there is only |