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function getExt1($file)
{
    return pathinfo($file, PATHINFO_EXTENSION);
}

function getExt2($file)
{
    return @end(explode('.', $file));
}

function getExt3($file)
{
    preg_match('/\.([a-zA-Z]+)$/', $file, $matches);

    return $matches[1];
}

function getExt4($file)
{
    return mb_substr($file, mb_strrpos($file, '.') + 1);
}