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

The best solution is to sort both array and then compare them:

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

As a function:

function array_equal($a, $b, $strict=false) {
    if (count($a) !== count($b)) {
        return false;
    }
    sort($a);
    sort($b);
    return ($strict && $a === $b) || $a == $b;
}

Here’s another algorithm looking for each element of A if it’s in B:

function array_equal($a, $b, $strict=false) {
    if (count($a) !== count($b)) {
        return false;
    }
    foreach ($a as $val) {
        $key = array_search($val, $b, $strict);
        if ($key === false) {
            return false;
        }
        unset($b[$key]);
    }
    return true;
}

But that has a complexity of O(n^2). So you better use the sorting method.