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                             zAdd

##### *Description*

Adds the specified member with a given score to the sorted set stored at key.

增加一個或多個元素，如果該元素已經存在，更新它的socre值
雖然有序集合有序，但它也是集合，不能重復元素，添加重復元素只會
更新原有元素的score值

##### *Parameters*

*key*
*score* : double
*value*: string

##### *Return value*

*Long* 1 if the element is added. 0 otherwise.

##### *Example*

```
<pre class="calibre9">$redis->zAdd('key', 1, 'val1');
$redis->zAdd('key', 0, 'val0');
$redis->zAdd('key', 5, 'val5');
$redis->zRange('key', 0, -1); // array(val0, val1, val5)
```

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