What potential pitfalls should be considered when working with UTF-16 encoded data in PHP?

When working with UTF-16 encoded data in PHP, one potential pitfall to consider is that PHP's string functions do not natively support UTF-16 encoding, which can lead to issues with string manipulation and encoding/decoding. To solve this issue, you can use the mbstring extension in PHP, which provides multi-byte string functions that can handle UTF-16 encoded data properly.

// Example of using mbstring functions to work with UTF-16 encoded data
$utf16String = "\xFF\xFE\x48\x00\x65\x00\x6C\x00\x6C\x00\x6F\x00"; // UTF-16 encoded "Hello"
$utf8String = mb_convert_encoding($utf16String, 'UTF-8', 'UTF-16LE'); // Convert UTF-16 to UTF-8

echo $utf8String; // Output: Hello