想必你会用javascript随机显示图片。但如果图片的资料(比如链接)是经常变化，或是由用户修改、增加的，怎么办？我这里有个办法。
把图片的资料(如名称、地址、链接等)放在一个TXT文件里(如有MYSQL更好，没有也罢)。HTML文件中由javascript调用PHP程序，PHP程序随机读取图片资料。程序见下：
假设有TP.TXT内容如下：(各字段分别代表‘图片名称’、‘链接位置’、‘图片位置’，字段间为TAB)
OSO www.oso.com.cn www.oso.com.cn/image/logo.gif
163 www.163.com image.163.com/images/logo.gif
sohu www.sohu.com www.sohu.com/image/logo.gif
readrand.php(此程序实际上是生成一句javascript语言)
$arrayall=file("tp.txt");读出tp.txt内容到数组
$arrays=count($arrayall);
if ($arrays==1){//because rand(0,0) is wrong
$selectrand=0;
}else{
srand((double)microtime()*1000000);//设定随机数种子
$selectrand=rand(0,$arrays-1);
}
$exstr=explode(chr(9),$arrayall[$selectrand]);//从全部中随机取出一个并分割
?>
document.write('');
HTML文件
(你可以把scripty放到你需要的位置，并可以加入setTimeout()函数以实现定时刷新)
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