php 文件下载

<?php
    $fileName=$_GET['file'];
    header('Content-type:application/force-download');
    header('Content-Disposition:inline,filename='.$fileName);
     
    $fp=fopen("文件目录".$fileName, "r");
    $content=fread($fp, filesize("文件目录".$fileName));
    echo $content;
?>