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<?php $filename = "songlist.txt";$handle = @fopen($filename, "r");if ($handle) {    while (!feof($handle)) {        $contents[] = fgets($handle);    }    fclose($handle);}$ySum = 0;$xSquaredSum = 0;$xSum = 0;$xySum = 0;$n = count($contents);echo '<pre>';var_dump($contents);echo '</pre>';foreach($contents as $x => $y){	$eks = $x + 1;	$ySum += $y;	$xSum += $eks;	$xySum += $eks*$y;	$xSquaredSum += $eks^2;}$b = (($ySum * $xSquaredSum) - ($xSum * $xySum)) / (($n * $xsquaredSum) - $xSum^2);$m = (($n * $xySum) - ($xSum*$ySum))/(($n*$xSquaredSum) - $xSum^2);echo "sigma(x) = $xSum<br/>";echo "sigma(x*y) = $xySum<br/>";echo "sigma(x^2) = $xSquaredSum<br/>";echo "sigman(y) = $ySum<br/>";echo "b = $b<br/>";echo "m = $m<br/>";?>