This is excercise to create a counter but when i go to see
the content of file i see the counter+2 ? 

P.s : $num2 that I read the second time it's right, I used
      it as a dump variable. If I remove $num++ all it's fine

<?php
if (!file_exists("counter.txt"))
    {
	$file=fopen("counter.txt","w");
	$num="0";
	}
	else
	{
	$file=fopen("counter.txt","r+");
	$num= fgets($file,4);
    }
print("<H1><BOLD>".$num." visite dal 22 maggio 2001</BOLD><BR><BR>");
$num=$num+1;
rewind($file);
print($num."<BR><BR>");
fputs($file,$num);
fclose($file);
$file=fopen("counter.txt","r+");
$num2= fgets($file,4);
print(" NUM2  ".$num2);
?>