PHP统计网站访问次数防刷新

<? @session_start(); $counter = intval(file_get_contents("counter.dat")); if(!$_SESSION['jingyun']) { $_SESSION['jingyun'] = true; $counter++; $fp = fopen("counter.dat","w"); fwrite($fp, $counter); fclose($fp); } ?> 总访问 <span style="font-size:14px; color:#FF6600" mce_style="font-size:14px; color:#FF6600"><?php echo "$counter";?></span> 次