## del, delete ##### Description Remove specified keys. 移除已经存在KEYS ##### Parameters An array of keys, or an undefined number of parameters, each a key: *key1* *key2* *key3* ... *keyN* *可以是一个KEYS的数组，或者一个未定义的数字参数，或者一个一个的写KEY* ##### Return value *Long* Number of keys deleted. 返回删除KEY-VALUE的数量 ##### Examples ``` <pre class="calibre9">$redis->set('key1', 'val1'); $redis->set('key2', 'val2'); $redis->set('key3', 'val3'); $redis->set('key4', 'val4'); $redis->delete('key1', 'key2'); /* return 2 */ $redis->delete(array('key3', 'key4')); /* return 2 */ ```