php交数组交集、差集、并集

$x = array(0=>'a', 1=>'b', 2=>'c', 3=>'d', 4=>'e');
$y = array(2=>'c', 4=>'e', 0=>'a');
$c = array_diff_key($x, $y);
$z = $y + $c;

$x = array(2=>'c', 4=>'e', 0=>'a');
$y = array(0=>'a', 1=>'b', 3=>'d');
//要求结果为：array(0=>'a', 4=>'e', 2=>'c');

//先求y x 交集(是yx不是xy)
$jj= array_intersect($y, $x);
//再求x y 差集
$bj = array_diff_key($x, $y);

$z= $jj + $bj;
print_r($z);
exit;

http://bbs.csdn.net/topics/390652942