How can special characters like ß, ä, Ä, ö, Ö, ü, Ü be properly handled in PHP string validation?

Special characters like ß, ä, Ä, ö, Ö, ü, Ü can be properly handled in PHP string validation by using the `mb_check_encoding()` function along with specifying the correct character encoding, such as UTF-8. This function can be used to check if a string contains valid characters in a specific encoding, ensuring that special characters are properly validated. 

$string = "Special characters like ä, ö, ü";
$encoding = 'UTF-8';

if (mb_check_encoding($string, $encoding)) {
    echo "String contains valid characters in UTF-8 encoding.";
} else {
    echo "String contains invalid characters in UTF-8 encoding.";
}

Keywords

PHP special characters string validation mb_detect_encoding utf-8

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