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 only need to compare one-way using array_diff() and use count() for the inverted relationship.

if (count($a1) == count($a2) && !array_diff($a1, $a2)) {
    // equal arrays
}