民勤县泉山镇学校:关于php编程

谁能告诉我怎么用php实现禁止刷新页面？我有一个计数器的代码，怎么让它不通过刷新进行计数？代码如下：
<?php
setcookie("WriteExpire","Expire in 1 second",0);
$countfile = "counter.txt";
if(($fp = fopen($countfile,"r+")) == false){
printf("open file %s failed!",$countfile);
exit;
}
else
{
$count = fread($fp,10);
$count = $count+1;
fclose($fp);
$fp = fopen($countfile,"w+");
fwrite($fp,$count);
fputs($fp,$fg);
echo "<div align=center><font size=5>计数器：$count</font><br>";
$fp = fopen($countfile,"r");
$array_count=1;
while(!feof($fp)){
$current_number=fgetc($fp);
$counter_array[$array_count]=$current_number;
$array_elements=count($counter_array);
$array_count=$array_count+1;
}
echo "<div align=center><font size=5>计数次数 ：";
for ($array_id=1;$array_id<$array_elements;++$array_id){
echo "<img src=countimg/".$counter_array[$array_id].".gif>";
}
echo "</font>";
fclose ($fp);
}

?>
</body>
</html>