How does the Collator Class in PHP help with sorting arrays containing special characters, and what are the requirements for using it effectively?

When sorting arrays containing special characters in PHP, the Collator class can be used to ensure that the sorting is done based on the correct locale-specific rules for handling special characters. This class provides methods for comparing and sorting strings in a way that respects the language-specific sorting rules, making it ideal for handling special characters.

// Example of sorting an array containing special characters using the Collator class
$collator = new Collator('en_US');
$array = ['apple', 'banana', 'cherry', 'éclair', 'äpfel', 'zebra'];
$collator->asort($array);
print_r($array);