## incr, incrBy ##### Description Increment the number stored at key by one. If the second argument is filled, it will be used as the integer value of the increment. 對指定的KEY的值自增1。如何填寫了第二個參數，將把第二個參數自增給KEY的值。 ##### Parameters *key* *value*: value that will be added to key (only for incrBy) ##### Return value *INT* the new value 返回新的INT數值 ##### Examples ``` <pre class="calibre9">$redis->incr('key1'); /* key1 didn't exists, set to 0 before the increment */ /* and now has the value 1 */ $redis->incr('key1'); /* 2 */ $redis->incr('key1'); /* 3 */ $redis->incr('key1'); /* 4 */ $redis->incrBy('key1', 10); /* 14 */ ```