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                ## zIncrBy ##### Description Increments the score of a member from a sorted set by a given amount. 將key對應的有序集合中member元素的scroe加上increment。如果指定的member不存在,那么將會添加該元素,并且其score的初始值為increment。如果key不存在,那么將會創建一個新的有序列表,其中包含member這一唯一的元素。如果key對應的值不是有序列表,那么將會發生錯誤。指定的score的值應該是能夠轉換為數字值的字符串,并且接收雙精度浮點數。同時,你也可用提供一個負值,這樣將減少score的值。 ##### Parameters *key* *value*: (double) value that will be added to the member's score *member* ##### Return value *DOUBLE* the new value ##### Examples ``` <pre class="calibre16">$redis->delete('key'); $redis->zIncrBy('key', 2.5, 'member1'); /* key or member1 didn't exist, so member1's score is to 0 before the increment */ /* and now has the value 2.5 */ $redis->zIncrBy('key', 1, 'member1'); /* 3.5 */ ``` ##
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