## String操作
#### set
~~~
// Simple key -> value set
$redis->set('key', 'value');
// Will redirect, and actually make an SETEX call
$redis->set('key','value', 10);
// Will set the key, if it doesn't exist, with a ttl of 10 seconds
$redis->set('key', 'value', Array('nx', 'ex'=>10));
// Will set a key, if it does exist, with a ttl of 1000 miliseconds
$redis->set('key', 'value', Array('xx', 'px'=>1000));
~~~
返回值為True是表示執行成功
#### get
`$redis->get('key');`
**Return value**
String or Bool: If key didn't exist, FALSE is returned. Otherwise, the value related to this key is returned.
#### strLen
**Return value**
返回整型長度
~~~
$redis->set('key', 'value');
$redis->strlen('key'); /* 5 */
~~~
