PHP: Built-in function to check whether two Array values are equal ( Ignoring the Order)

Question

Is there a built-in function for PHP for me to check whether two arrays contain the same values ( order not important?).

For example, I want a function that returns

Answer 1

You can use array_diff.

$a = array('4','5','2');
$b = array('2','4','5');

if(count(array_diff($a, $b)) == 0) {
  // arrays contain the same elements
} else {
  // arrays contain different elements
}

However, a problem with this approach is that arrays can contain duplicate elements, and still match.