What potential pitfalls should be considered when using array_multisort in PHP for sorting arrays?

When using array_multisort in PHP for sorting arrays, potential pitfalls to consider include ensuring that the arrays being sorted are of equal length, as array_multisort will reindex the arrays if they are not. Additionally, be aware that array_multisort modifies the original arrays in place, so make sure to create a copy of the array if you need to preserve the original data. Finally, be mindful of the sorting order specified in the function call, as array_multisort can sort in ascending or descending order.

// Example of using array_multisort with precautions
$array1 = [3, 1, 2];
$array2 = ['c', 'a', 'b'];

// Check if arrays are of equal length
if(count($array1) === count($array2)) {
    // Make a copy of the arrays
    $array1_copy = $array1;
    $array2_copy = $array2;

    // Sort the arrays in ascending order
    array_multisort($array1, $array2);

    // Output sorted arrays
    print_r($array1);
    print_r($array2);

    // Original arrays remain unchanged
    print_r($array1_copy);
    print_r($array2_copy);
} else {
    echo "Arrays are not of equal length.";
}