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下面我们从剖析一个最简单的计数器开始

计数器的功能是:刷新一次页面,数字增加一.
程序如下

Code:[Copy to clipboard]<?
$datafile="data.txt";
$fp1=fopen($datafile,"r");
$num=fgets($fp1,10);
$num=trim($num);
fclose($fp1);
echo "您是第".$num."位客人";
$fp2=fopen($datafile,"w");
$num=$num+1;
fputs($fp2,"$num");
fclose($fp2);
?>
下面是对该程序的详细解释Code:[Copy to clipboard]<?




$datafile="data.txt";



$fp1=fopen($datafile,"r");



$num=fgets($fp1,10);



$num=trim($num);


fclose($fp1);


echo "您是第".$num."位客人";



$fp2=fopen($datafile,"w");


$num=$num+1;


fputs($fp2,"$num");


fclose($fp2);
?>

（出处：www.iphp.org）