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php实现随机显示图片方法汇总_PHP

WBOYOriginal: 2016-05-30 08:47:391390browse

php通过rand()函数产生随机数，这个函数可以产生一个指定范围的数字

这段代码通过产生的随机数，随机选择图片

<html>
<body>
<&#63;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 / alt="php实现随机显示图片方法汇总_PHP" >";
&#63;>
</body>
</html>

方法二：

<&#63;
$handle = opendir('./'); //当前目录
while (false !== ($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
&#63;>
<img  src="<&#63;=$array[$suiji]&#63; alt="php实现随机显示图片方法汇总_PHP" >">

方法三：

<&#63;php
/**********************************************
* Filename : img.php
* Author : freemouse
* Usage:
* <img  src=img.php alt="php实现随机显示图片方法汇总_PHP" >
* <img  src=img.php&#63;folder=images2/ alt="php实现随机显示图片方法汇总_PHP" >
***********************************************/
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]");
&#63;>

以上所述就是本文的全部内容了，希望大家能够喜欢。

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