What best practices should be followed when writing PHP functions for comparing arrays?

When writing PHP functions for comparing arrays, it is important to follow best practices to ensure accurate and efficient comparisons. One common approach is to use the array_diff() function, which returns the values in the first array that are not present in the second array. This function helps to identify any differences between two arrays and is useful for comparing their contents.

// Function to compare two arrays and return the differences
function compareArrays($array1, $array2) {
    $differences = array_diff($array1, $array2);
    
    if(empty($differences)) {
        return "Arrays are identical.";
    } else {
        return "Arrays have differences: " . implode(", ", $differences);
    }
}

// Example of using the function
$array1 = [1, 2, 3, 4, 5];
$array2 = [2, 3, 4];
echo compareArrays($array1, $array2);