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zRangeByScore 命令/方法/函数

Returns the elements of the sorted set stored at the specified key which have scores in the range [start,end]. Adding a parenthesis before start or end excludes it from the range. +inf and -inf are also valid limits. zRevRangeByScore returns the same items in reverse order, when the start and end parameters are swapped.

返回key对应的有序集合中score介于min和max之间的所有元素(包哈score等于min或者max的元素)。元素按照score从低到高的顺序排列。如果元素具有相同的score,那么会按照字典顺序排列。

可选的选项LIMIT可以用来获取一定范围内的匹配元素。如果偏移值较大,有序集合需要在获得将要返回的元素之前进行遍历,因此会增加O(N)的时间复杂度。可选的选项WITHSCORES可以使得在返回元素的同时返回元素的score,该选项自从Redis 2.0版本后可用。


Parameters

key

start: string

end: string

options: array


Two options are available: withscores => TRUE, and limit => array($offset, $count)


Return value

Array containing the values in specified range.


Example

$redis->zAdd('key', 0, 'val0');

$redis->zAdd('key', 2, 'val2');

$redis->zAdd('key', 10, 'val10');

$redis->zRangeByScore('key', 0, 3); /* array('val0', 'val2') */

$redis->zRangeByScore('key', 0, 3, array('withscores' => TRUE); /* array('val0' => 0, 'val2' => 2) */

$redis->zRangeByScore('key', 0, 3, array('limit' => array(1, 1)); /* array('val2' => 2) */

$redis->zRangeByScore('key', 0, 3, array('limit' => array(1, 1)); /* array('val2') */

$redis->zRangeByScore('key', 0, 3, array('withscores' => TRUE, 'limit' => array(1, 1)); /* array('val2' => 2) */

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