How can PHP developers ensure that their code efficiently handles unique values in arrays without compromising performance?

To efficiently handle unique values in arrays without compromising performance, PHP developers can use the `array_unique()` function. This function removes duplicate values from an array while preserving the keys. By using `array_unique()`, developers can ensure that their code processes unique values in arrays quickly and effectively.

// Example code snippet using array_unique() to handle unique values in an array
$array = [1, 2, 2, 3, 4, 4, 5];
$uniqueArray = array_unique($array);
print_r($uniqueArray);