What are the potential pitfalls when using mb_detect_encoding in PHP to determine the encoding of a string?

Using mb_detect_encoding in PHP to determine the encoding of a string can be unreliable as it relies on heuristics rather than definitive rules. This can lead to incorrect or inconsistent results, especially with short or mixed-encoding strings. To improve accuracy, it's recommended to use a more robust encoding detection library or specify the encoding if known.

// Example of using a more robust encoding detection library like Encoding from Symfony
use Symfony\Component\String\Encoding;

$encoding = Encoding::detect($string);
echo $encoding;