php比较两个数组相同的元素与不同的元素

php获取两个数组相同元素array_intersect

$a = [1,2,3];
$b = [5,4,2];
$c = array_intersect($a,$b);
echo '<pre>';
var_dump(array_values($c));
die;

array(1) {
  [0]=>
  int(2)
}

 php获取两个数组不相同元素array_diff

$a = [1,2,3,9];
$b = [5,4,2,8];
$c = array_diff($a,$b);
$d = array_diff($b,$a);
echo '<pre>';
var_dump($c);
var_dump($d);
$arr3 = array_merge(array_diff($a,$b),array_diff($b,$a));
var_dump($arr3);

array(3) {
  [0]=>
  int(1)
  [2]=>
  int(3)
  [3]=>
  int(9)
}
array(3) {
  [0]=>
  int(5)
  [1]=>
  int(4)
  [3]=>
  int(8)
}
array(6) {
  [0]=>
  int(1)
  [1]=>
  int(3)
  [2]=>
  int(9)
  [3]=>
  int(5)
  [4]=>
  int(4)
  [5]=>
  int(8)
}