debian php中如何实现文件上传下载

文件上传：

1. 在HTML表单中添加一个文件上传的input标签：

<form action="upload.php" method="post" enctype="multipart/form-data">     <input type="file" name="file">     <input type="submit" value="Upload"> </form> 

2. 创建一个PHP处理文件上传的脚本upload.php：

<?php $target_dir = "uploads/"; $target_file = $target_dir . basename($_FILES["file"]["name"]); if (move_uploaded_file($_FILES["file"]["tmp_name"], $target_file)) {     echo "The file ". basename( $_FILES["file"]["name"]). " has been uploaded."; } else {     echo "Sorry, there was an error uploading your file."; } ?> 

文件下载：

1. 创建一个PHP脚本download.php来处理文件下载请求：

<?php $file = 'path/to/file.txt'; header('Content-Description: File Transfer'); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename="'.basename($file).'"'); header('Expires: 0'); header('Cache-Control: must-revalidate'); header('Pragma: public'); header('Content-Length: ' . filesize($file)); readfile($file); exit; ?> 

2. 在需要提供文件下载的页面中创建一个链接指向download.php，传递文件名参数：

<a href="download.php?file=file.txt">Download file</a>