Summary of methods for randomly displaying images in PHP_PHP Tutorial

A summary of methods to randomly display images in PHP

This article shares a function to randomly display images in PHP, which can randomly display images stored in a specified folder. Friends who are interested can study it.

PHP generates random numbers through the rand() function. This function can generate a number within a specified range

This code randomly selects pictures by generating random numbers

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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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<🎜>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 : "; ?>

Method 2: 　?

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<🎜>$handle = opendir('./'); //Current directory<🎜> <🎜>while (false !== ($file = readdir($handle))) { //Traverse the directory where the php tutorial file is located <🎜> <🎜>list($filesname,$kzm)=explode(".",$file);//Get the extension<🎜> <🎜>if ($kzm=="gif" or $kzm=="jpg") { //File filtering<🎜> <🎜>if (!is_dir('./'.$file)) { //Folder filtering<🎜> <🎜>$array[]=$file;//Save the file names that meet the conditions into the array<🎜> <🎜>}<🎜> <🎜>}<🎜> <🎜>}<🎜> <🎜>$suiji=array_rand($array); //Use array_rand function to randomly select a unit from the array<🎜> <🎜>?>

　　方法三：

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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]"); ?>

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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]"); ?>

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