<html>
<body>
<?php
 srand( microtime() * 1000000 );
 $num = rand( 1, 4 );
  
 switch( $num )
 {
 case 1: $image_file = "/home/images/alfa.jpg";
     break;
 case 2: $image_file = "/home/images/ferrari.jpg";
     break;
 case 3: $image_file = "/home/images/jaguar.jpg";
     break;
 case 4: $image_file = "/home/images/porsche.jpg";
     break;
 }
 echo "Random Image : <img src=$image_file />";
?>
</body>
</html>

方法二：

<?
$handle = opendir('./'); //當前目錄
while (false !== ($file = readdir($handle))) { //遍歷該php教程文件所在目錄
list($filesname,$kzm)=explode(".",$file);//獲取擴展名
if ($kzm=="gif" or $kzm=="jpg") { //文件過濾
if (!is_dir('./'.$file)) { //文件夾過濾
$array[]=$file;//把符合條件的文件名存入數(shù)組
}
}
}
$suiji=array_rand($array); //使用array_rand函數(shù)從數(shù)組中隨機抽出一個單元
?>
<img src="<?=$array[$suiji]?>">

方法三：

<?php
/**********************************************
* Filename : img.php
* Author : freemouse
* Usage:
* <img src=img.php>
* <img src=img.php?folder=images2/>
***********************************************/
if($_GET['folder']){
$folder=$_GET['folder'];
}else{
$folder='/images/';
}
//存放圖片文件的位置
$path = $_SERVER['DOCUMENT_ROOT']."/".$folder;
$files=array();
if ($handle=opendir("$path")) {
while(false !== ($file = readdir($handle))) {
if ($file != "." && $file != "..") {
if(substr($file,-3)=='gif' || substr($file,-3)=='jpg') $files[count($files)] = $file;
}
}
}
closedir($handle);
$random=rand(0,count($files)-1);
if(substr($files[$random],-3)=='gif') header("Content-type: image/gif");
elseif(substr($files[$random],-3)=='jpg') header("Content-type: image/jpeg");
readfile("$path/$files[$random]");
?>

以上所述就是本文的全部內(nèi)容了，希望大家能夠喜歡。

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