zRank, zRevRank 命令/方法/函数

Returns the rank of a given member in the specified sorted set, starting at 0 for the item with the smallest score. zRevRank starts at 0 for the item with the largest score.

返回key对应的有序集合中member元素的索引值,元素按照score从低到高进行排列。rank值(或index)是从0开始的,这意味着具有最低score值的元素的rank值为0。使用ZREVRANK可以获得从高到低排列的元素的rank(或index)。


Parameters

key

member


Return value

Long, the item's score.


Example

$redis->delete('z');

$redis->zAdd('key', 1, 'one');

$redis->zAdd('key', 2, 'two');

$redis->zRank('key', 'one'); /* 0 */

$redis->zRank('key', 'two'); /* 1 */

$redis->zRevRank('key', 'one'); /* 1 */

$redis->zRevRank('key', 'two'); /* 0 */