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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 |
---|---|
2256 | if ( ! empty($meta_value) ) |
2257 | $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) ); |
2258 | else |
2259 | $wpdb->query( $wpdb->prepare("DELETE FROM $wpdb->usermeta WHERE user_id = %d AND meta_key = %s", $user_id, $meta_key) ); |
2260 |
|
2261 | clean_user_cache( $user_id ); |
2262 | wp_cache_delete( $user_id, 'user_meta' ); |
2263 |
|
2264 | if ( $cur && $cur->umeta_id ) |
2265 | do_action( 'deleted_usermeta', $cur->umeta_id, $user_id, $meta_key, $meta_value ); |
2266 |
|
2267 | return true; |
2268 | } |
2269 |
|
2270 | /** |
2271 | * Retrieve user metadata. |
2272 | * |
2273 | * If $user_id is not a number, then the function will fail over with a 'false' |
2274 | * boolean return value. Other returned values depend on whether there is only |