【转载】php运用readfile函数实现上载文件权限判断

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Release: 2016-06-13 13:15:28
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【转载】php运用readfile函数实现下载文件权限判断

转自:http://www.imphper.cn/imphper-php-view.php?view=single&id=89

本人有修改!

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<?php $file = get_file_address();// 文件的真实地址(支持url,不过不建议用url)   

if (file_exists($file))
{   
    header('Content-Description: File Transfer');   
    header('Content-Type: application/octet-stream');   
    header('Content-Disposition: attachment; filename='.basename($file));   
    header('Content-Transfer-Encoding: binary');   
    header('Expires: 0');   
    header('Cache-Control: must-revalidate, post-check=0, pre-check=0');   
    header('Pragma: public');   
    header('Content-Length: ' . filesize($file));   
    ob_clean();   //重要的就是这个函数的调用, 清空但不关闭输出缓存, 否则下载的文件头两个字符会是0a
    flush();   
    readfile($file);   // 输出文件内容
}   
?>  
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