本文分享一個php實現的隨機顯示圖片的函數,可以將指定檔案夾中存放的圖片隨機地顯示出來。有興趣的朋友研究下吧。
php通過rand()函數產生隨機數，這個函數可以產生一個指定範圍的數字
這段代碼通過產生的隨機數，隨機播放圖片
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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | <html> <body> <?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 />"; ?> </body> </html> |
方法二：
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| 1 2 3 4 5 6 7 8 9 10 11 12 13 | <? $handle = opendir('./'); //目前的目錄 while (false !== ($file = readdir($handle))) { //遍曆該php教程檔案所在目錄 list($filesname,$kzm)=explode(".",$file);//擷取副檔名 if ($kzm=="gif" or $kzm=="jpg") { //檔案過濾 if (!is_dir('./'.$file)) { //檔案夾過濾 $array[]=$file;//把合格檔案名稱存入數組 } } } $suiji=array_rand($array); //使用array_rand函數從數組中隨機抽出一個單元 ?> <img src="<?=$array[$suiji]?>"> |
方法三：
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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | <?php /********************************************** * Filename : img.php * Author : freemouse * Usage: * <img src=img.php> * <img src=img.php?folder=images2/> ***********************************************/ if($_GET['folder']){ $folder=$_GET['folder']; }else{ $folder='/images/'; } //存放圖片檔案的位置 $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]"); ?> |
以上所述就是本文的全部內容了，希望大家能夠喜歡。
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