Debian PHP如何实现文件上传 - 问答

在Debian系统上使用PHP实现文件上传，你需要遵循以下步骤：

创建一个HTML表单，用于选择和上传文件：

<!DOCTYPE html>
<html>
<head>
    <title>File Upload</title>
</head>
<body>

<form action="upload.php" method="post" enctype="multipart/form-data">
  Select image to upload:
  <input type="file" name="fileToUpload" id="fileToUpload">
  <input type="submit" value="Upload Image" name="submit">
</form>

</body>
</html>

创建一个名为upload.php的PHP文件，用于处理文件上传：

<?php
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));
$uploadOk = 1;

// Check if image file is an actual image or fake image
if(isset($_POST["submit"])) {
    $check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
    if($check !== false) {
        echo "File is an image - " . $check["mime"] . ".";
        $uploadOk = 1;
    } else {
        echo "File is not an image.";
        $uploadOk = 0;
    }
}

// Check if file already exists
if (file_exists($target_file)) {
    echo "Sorry, file already exists.";
    $uploadOk = 0;
}

// Check file size
if ($_FILES["fileToUpload"]["size"] > 500000) {
    echo "Sorry, your file is too large.";
    $uploadOk = 0;
}

// Allow certain file formats
if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
&& $imageFileType != "gif" ) {
    echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
    $uploadOk = 0;
}

// Check if $uploadOk is set to 0 by an error
if ($uploadOk == 0) {
    echo "Sorry, your file was not uploaded.";
// if everything is ok, try to upload file
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
        echo "The file ". htmlspecialchars( basename( $_FILES["fileToUpload"]["name"])). " has been uploaded.";
    } else {
        echo "Sorry, there was an error uploading your file.";
    }
}
?>

确保你的Debian系统已经安装了PHP。如果没有，请使用以下命令安装：

sudo apt-get update
sudo apt-get install php

安装PHP的文件上传模块（如果尚未安装）：

sudo apt-get install php-common
sudo apt-get install php-cli
sudo apt-get install php-fpm

重启PHP-FPM服务以应用更改：

sudo systemctl restart php-fpm

创建一个名为uploads的目录，用于存储上传的文件：

mkdir uploads

将HTML文件保存为index.html，并将其放在Web服务器的根目录中（例如/var/www/html）。
使用浏览器访问http://your_server_ip/index.html，然后尝试上传一个文件。如果一切正常，文件将被上传到uploads目录。

注意：在实际部署中，请确保对上传的文件进行适当的验证和安全检查，以防止潜在的安全风险。

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