用PHP显示随机图像

Posted 2021-02-25

Change $dir to image folder

<?php
Header("Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0");
Header("Expires: Thu, 19 Nov 1981 08:52:00 GMT");
Header("Pragma: no-cache");
Header("Content-Type: image/gif");
 
$dir = "img/backgrounds";
//$imglist = "";
srand((double)microtime()*1000000);
$i = 0;
if(is_dir($dir)){
    if($dh = opendir($dir)){ 
        while(($file = readdir($dh)) !== false){
            if($file != '..' && $file != '.'){
                $image[$i] = $file;
                $i++;
            }
        }
        closedir($dh);
    }
}
$n = rand(0,(count($image)-1));
 
if(!readfile($dir."/".$image[$n])) // Read the image 
readfile($dir."error/error.gif"); // If the script can't find the directory, display this image
?>