find last line in csv found on stack

gistfile1.txt

function getLastLine($file, $bufferSize){
    $fp = fopen($file, 'r');
    $size = filesize($file);
    $buffer = '';
    for ($pos = $size - $bufferSize; ; $pos -= $bufferSize) {
        $pos = max(0, $pos);
        fseek($fp, $pos);

        $b = rtrim(fread($fp, $bufferSize));
        $nlPos = strrpos($b, "\n");

        if ($nlPos !== false) {
            $buffer = substr($b, $nlPos) . $buffer;
            break;
        }
        else {
            $buffer = $b . $buffer;
        }

        if ($pos == 0) {
            break;
        }
    }

    return trim($buffer);

}