What potential pitfalls should be considered when sorting array values in PHP?

When sorting array values in PHP, it is important to consider potential pitfalls such as maintaining the original keys of the array, ensuring proper data type comparison, and handling any null values that may be present. To address these issues, you can use the `asort()` function to sort an array by values while maintaining the key-value associations, use the appropriate comparison functions like `strcmp()` for string values and `intval()` for integer values, and handle null values by converting them to a placeholder value before sorting.

// Example array with mixed data types and null values
$array = [3, '2', null, '1', 5, null];

// Convert null values to a placeholder value before sorting
foreach ($array as $key => $value) {
    if ($value === null) {
        $array[$key] = 'NULL';
    }
}

// Sort the array by values while maintaining key-value associations
asort($array, SORT_STRING);

// Output the sorted array
print_r($array);