PHP 实现下载文件的方法

<span  1</span> <span 方法一：
</span><span  2</span> <span header</span>('Content-Description: File Transfer'<span );
</span><span  3</span> <span header</span>('Content-Type: application/octet-stream'<span );
</span><span  4</span> <span header</span>('Content-Disposition: attachment; filename='.<span basename</span>(<span $filepath</span><span ));
</span><span  5</span> <span header</span>('Content-Transfer-Encoding: binary'<span );
</span><span  6</span> <span header</span>('<span Expires: 0&prime;);
</span><span  7</span> header('Cache-Control: must-revalidate, post-check=0, pre-check=0<span &prime;);
</span><span  8</span> <span header</span>('Pragma: public'<span );
</span><span  9</span> <span header</span>('Content-Length: ' . <span filesize</span>(<span $filepath</span><span ));
</span><span 10</span> <span readfile</span>(<span $file_path</span><span );
</span><span 11</span> 
<span 12</span> <span 方法二：
</span><span 13</span> <span $fileinfo</span> = <span pathinfo</span>(<span $filename</span><span );
</span><span 14</span> <span header</span>('Content-type: application/x-'.<span $fileinfo</span>['extension'<span ]);
</span><span 15</span> <span header</span>('Content-Disposition: attachment; filename='.<span $fileinfo</span>['basename'<span ]);
</span><span 16</span> <span header</span>('Content-Length: '.<span filesize</span>(<span $filename</span><span ));
</span><span 17</span> <span readfile</span>(<span $thefile</span><span );
</span><span 18</span> <span exit</span>();