随机取图的PHP代码

<?
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// 用法
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// include("ranimage.php");
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// 或者
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// require "ranimage.php";
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$dir = "";
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function Get_Image_list($dir) {
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if(!$dir) {
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$dir = ".";
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}
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$file_array = array();
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$dir_handle = opendir($dir);
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$a = 0;
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while($file = readdir($dir_handle)) {
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if((preg_match('/jpg/',$file)) ||
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(preg_match('/png/',$file)) ||
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(preg_match('/gif/',$file)) ||
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(preg_match('/jpeg/',$file))) {
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$file_array[$a] = $file;
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$a++;
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}
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}
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return $file_array;
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}
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$files = Get_Image_list($dir);
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$max = count($files)-1;
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srand((double)microtime()*1000000);
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$index = rand(0,$max);
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$image_name = $files[$index];
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echo("<IMG SRC="".$image_name."">");
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?>
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