Remove common items from multiple arrays

Question

$array1 = array("a","b");

$array2 = array("b","c");

I want the following array from above arrays containing items which are not common in both arrays.

$output = array("a","c");

I have tried folloing

$output = array_diff($array1,$array2);

How can do it. Thanks.

Answer 1

Just make subtraction of union and intersection:

$array1 = array("a","b");    
$array2 = array("b","c");

$output = array_diff(array_merge($array1, $array2), array_intersect($array1, $array2));