复制代码 代码如下:

<?php
/**
* 功能：随机显示图片
* Filename  : img.php
* Usage:
*             <img src=img.php>
*             <img src=img.php?folder=images2/>
**/
  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]\");
?>