php实现随机显示图片方法汇总_PHP教程

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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 : ";

?>

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$handle = opendir('./'); //当前目录

while (false !== ($file = readdir($handle))) { //遍历该php教程文件所在目录

list($filesname,$kzm)=explode(".",$file);//获取扩展名

if ($kzm=="gif" or $kzm=="jpg") { //文件过滤

if (!is_dir('./'.$file)) { //文件夹过滤

$array[]=$file;//把符合条件的文件名存入数组

}

}

}

$suiji=array_rand($array); //使用array_rand函数从数组中随机抽出一个单元

?>

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/**********************************************

* Filename : img.php

* Author : freemouse

* Usage:

*

*

***********************************************/

if($_GET['folder']){

$folder=$_GET['folder'];

}else{

$folder='/images/';

}

//存放图片文件的位置

$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]");

?>