What are some potential pitfalls in comparing and sorting arrays in PHP?

One potential pitfall in comparing and sorting arrays in PHP is that the comparison operator (==) may not work as expected for arrays, as it only checks if the arrays have the same key/value pairs in the same order. To properly compare arrays, you should use the `array_diff` function to compare the values of two arrays or `array_diff_assoc` to compare both keys and values. 

$array1 = [1, 2, 3];
$array2 = [3, 2, 1];

// Incorrect comparison using ==
if ($array1 == $array2) {
    echo "Arrays are equal";
} else {
    echo "Arrays are not equal";
}

// Correct comparison using array_diff
if (empty(array_diff($array1, $array2)) && empty(array_diff($array2, $array1))) {
    echo "Arrays are equal";
} else {
    echo "Arrays are not equal";
}

Keywords

array comparison array sorting PHP strict comparison sorting algorithms

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