$a = [1,2,3];
$b = [2,3,7,1,5];
$arr3 = array_merge(array_diff($a,$b),array_diff($b,$a));
$a = [1,2,3];
$b = [2,3,7,1,5];
$arr3 = array_merge(array_diff($a,$b),array_diff($b,$a));

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