function singleQuoteReplace($param1 = false, $param2 = false, $param3)
{
    return str_replace("'", "''", str_replace("\'", "'", $param3));
}
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.