What potential pitfalls should be considered when comparing multidimensional arrays in PHP?

When comparing multidimensional arrays in PHP, one potential pitfall to consider is that using the == operator may not give the expected results, as it compares values without considering the keys. To accurately compare multidimensional arrays, you should use the === operator to also check if the keys match. This ensures that both the values and the keys are identical in both arrays. 

$array1 = array("a" => array("1", "2"), "b" => array("3", "4"));
$array2 = array("a" => array("1", "2"), "b" => array("3", "4"));

if ($array1 === $array2) {
    echo "Arrays are identical";
} else {
    echo "Arrays are not identical";
}

Keywords

multidimensional arrays comparison PHP array_diff nested arrays

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