Sanitize file name

function filter_filename($filename, $beautify=true) {
    // sanitize filename
    $filename = preg_replace(
        '~
        [<>:"/\\|?*]|            # file system reserved https://en.wikipedia.org/wiki/Filename#Reserved_characters_and_words
        [\x00-\x1F]|             # control characters http://msdn.microsoft.com/en-us/library/windows/desktop/aa365247%28v=vs.85%29.aspx
        [\x7F\xA0\xAD]|          # non-printing characters DEL, NO-BREAK SPACE, SOFT HYPHEN
        [#\[\]@!$&\'()+,;=]|     # URI reserved https://tools.ietf.org/html/rfc3986#section-2.2
        [{}^\~`]                 # URL unsafe characters https://www.ietf.org/rfc/rfc1738.txt
        ~x',
        '-', $filename);
    // avoids ".", ".." or ".hiddenFiles"
    $filename = ltrim($filename, '.-');
    // optional beautification
    if ($beautify) $filename = beautify_filename($filename);
    // maximize filename length to 255 bytes http://serverfault.com/a/9548/44086
    $ext = pathinfo($filename, PATHINFO_EXTENSION);
    $filename = mb_strcut(pathinfo($filename, PATHINFO_FILENAME), 0, 255 - ($ext ? strlen($ext) + 1 : 0), mb_detect_encoding($filename)) . ($ext ? '.' . $ext : '');
    return $filename;
}

Source: stackoverflow.com

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