通过PHP下载文件

php 下载文件示例：

<?php
$file = 'monkey.gif';

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($file));
    ob_clean();
    flush();
    readfile($file);
    exit;
}
?>

PS：PDF预览代码：

<?php
    public function fddAction()
    {
        // get attachment location
        $attachment_location = $_SERVER["DOCUMENT_ROOT"] . "/pdf/fdd/sample.pdf";
         
        if (file_exists($attachment_location)) {
            // attachment exists
             
            // send open pdf dialog to user
            header('Cache-Control: public'); // needed for i.e.
            header('Content-Type: application/pdf');
            header('Content-Disposition: inline; filename="sample.pdf"');
            readfile($attachment_location);
            die(); // stop execution of further script because we are only outputting the pdf
             
        } else {
            die('Error: File not found.');
        }
    }
?>