rpoplpush

rpoplpush (redis >= 1.1)

Description

Pops a value from the tail of a list, and pushes it to the front of another list. Also return this value.

从源LIST的最后弹出一个元素，并且把这个元素从目标LIST的顶部（左侧）压入目标LIST。

Parameters

Key: srckey
Key: dstkey

Return value

STRING The element that was moved in case of success, FALSE in case of failure.

Example

$redis->delete('x', 'y');

$redis->lPush('x', 'abc');
$redis->lPush('x', 'def');
$redis->lPush('y', '123');
$redis->lPush('y', '456');

// move the last of x to the front of y.
var_dump($redis->rpoplpush('x', 'y'));
var_dump($redis->lRange('x', 0, -1));
var_dump($redis->lRange('y', 0, -1));

Output:

string(3) "abc"
array(1) {
  [0]=>
  string(3) "def"
}
array(3) {
  [0]=>
  string(3) "abc"
  [1]=>
  string(3) "456"
  [2]=>
  string(3) "123"
}