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

A simple way to handle this in PHP Version >= 5.6 is to use the splat operator also called Argument Unpacking.

$arr = array_unique(array_merge(...$arr));