$_POST['response'] = 3;
        $c = 0;
        $file1 = fopen("polls/results-$c.txt","r");
        $file2 = fopen("polls/results-$c.txt-new","w");
                $i = 0;
                $a = 0;
                while (!feof($file1)) {
                        $a = fgets($file1,4096);
                        if ($i == $_POST['response'])
                                $a = $a + 1;
                        fputs($file2, $a);
                        $i = $i + 1;
                }
        fclose($file2);
        fclose($file1);

results-0.txt:
0
0
0
0
0
0
0

results-0.txt-new:
0
0
0
10
0
0
0