Util.php

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<?php

namespace ILIAS\Filesystem;

class Util
{
    private const FUNKY_WHITESPACES = '#\p{C}+#u';
    private const ZERO_JOINER = '/\\x{00ad}|\\x{0083}|\\x{200c}|\\x{200d}|\\x{2062}|\\x{2063}/iu';
    private const SOFT_HYPHEN = "/\\x{00a0}/iu";
    private const CONTROL_CHARACTER = "/\\x{00a0}/iu";

    public static function sanitizeFileName(string $filename) : string
    {
        // remove control characters
        $filename = preg_replace('/[\x00-\x1F\x7F]/u', '', $filename);
        $filename = preg_replace(self::CONTROL_CHARACTER, '', $filename);

        // remove other characters
        $filename = preg_replace(self::FUNKY_WHITESPACES, '', $filename);
        $filename = preg_replace(self::SOFT_HYPHEN, ' ', $filename);
        $filename = preg_replace(self::ZERO_JOINER, '', $filename);

        // UTF normalization form C
        return \UtfNormal::NFC($filename);
    }
}