How to merge subarray in PHP most easily?

Question

$arr[] = array(\'A\',\'B\');
$arr[] = array(\'C\',\'B\');
...

I need to get the merged result of all sub array of $arr .

And f

Answer 1

If you really don't want to loop, try this:

$arr[] = array('A','B');
$arr[] = array('C','B');
$arr[] = array('C','D');
$arr[] = array('F','A');
$merged = array_unique(call_user_func_array('array_merge', $arr));