Performs a sInter command and stores the result in a new set.
执行一个交集操作，并把结果存储到一个新的SET容器中。
Parameters
Key: dstkey, the key to store the diff into.
key 储存结果的SET容器KEY
Keys: key1, key2... keyN. key1..keyN are intersected as in sInter.
求交集的KEYS
Return value
INTEGER: The cardinality of the resulting set, or FALSE in case of a missing key.
Example
$redis->sAdd('key1', 'val1');
$redis->sAdd('key1', 'val2');
$redis->sAdd('key1', 'val3');
$redis->sAdd('key1', 'val4');
$redis->sAdd('key2', 'val3');
$redis->sAdd('key2', 'val4');
$redis->sAdd('key3', 'val3');
$redis->sAdd('key3', 'val4');
var_dump($redis->sInterStore('output', 'key1', 'key2', 'key3'));
var_dump($redis->sMembers('output'));
Output:
int(2)
array(2) {
[0]=>
string(4) "val4"
[1]=>
string(4) "val3"
}