debian php中如何實現文件上傳下載

文件上傳：

1. 在HTML表單中添加一個文件上傳的input標簽：

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

2. 創建一個PHP處理文件上傳的腳本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.";
}
?>

文件下載：

1. 創建一個PHP腳本download.php來處理文件下載請求：

<?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. 在需要提供文件下載的頁面中創建一個鏈接指向download.php，傳遞文件名參數：

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