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How to upload files in Linux environment through PHP script

王林

Oct 05, 2023 pm 01:17 PM

phplinuxScript

How to upload files in Linux environment through PHP script

In web development, file upload is a common functional requirement. As a server-side scripting language, PHP can easily handle file upload operations. This article will introduce in detail how to use PHP scripts to upload files in a Linux environment, and give specific code examples.

First, in the Linux environment, we need to install and configure PHP. If you already have PHP installed, you can skip this step. The following is the command to install PHP under Ubuntu system:

sudo apt update
sudo apt install php

After the installation is complete, we can create a simple file upload form. In HTML, we can use the tag to create a file selection box. The following is an example of a simple file upload form:

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

In the above form, we set the "action" attribute of the form to "upload.php", which means that when submitting the form, the file will be uploaded to a In a PHP script named "upload.php". At the same time, we also need to set "multipart/form-data" in the "enctype" attribute of the form to ensure that file uploads can be processed correctly.

Next, we create a PHP script called "upload.php" to handle file uploads. The following is an example of a simple PHP script for file upload:

<?php
$targetDir = "uploads/";     // 设置上传文件的目录
$targetPath = $targetDir . basename($_FILES["fileToUpload"]["name"]);     // 设置上传文件的路径

// 检查文件的类型
$uploadOk = 1;
$fileType = strtolower(pathinfo($targetPath, PATHINFO_EXTENSION));
if($fileType != "jpg" && $fileType != "png" && $fileType != "jpeg"
    && $fileType != "gif" ) {
    echo "只允许上传jpg、png、jpeg、gif格式的文件！";
    $uploadOk = 0;
}

// 检查文件的大小
if ($_FILES["fileToUpload"]["size"] > 500000) {
    echo "文件大小不能超过500KB！";
    $uploadOk = 0;
}

// 检查文件是否已存在
if (file_exists($targetPath)) {
    echo "文件已存在！";
    $uploadOk = 0;
}

// 如果没有错误，将文件移动到目标路径
if ($uploadOk == 0) {
    echo "文件上传失败！";
} else {
    if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $targetPath)) {
        echo "文件上传成功！";
    } else {
        echo "文件上传失败！";
    }
}
?>

In the above PHP script, first we define a target folder "uploads/" for storing uploaded files. Then, we use the basename() function to get the name of the uploaded file and concatenate it with the target folder to get the target path "targetPath".

Next, we performed some verification based on the type and size of the uploaded file. If the file type does not meet the requirements or the file size exceeds the limit, a corresponding error message will be output and the "uploadOk" variable will be set to 0, indicating that the file cannot be uploaded.

Finally, if there is no problem with file verification, we use the move_uploaded_file() function to move the uploaded file from the temporary path to the target path. If the move is successful, "File upload successful!" is output; otherwise, "File upload failed!" is output.

Now, we just need to place the HTML files and PHP files in the directory of the web server and make sure that the target folder "uploads/" exists. When we access the HTML file, select the file and submit the form, the file will be uploaded to the target folder and the corresponding upload results will be displayed.

Through the introduction and code examples of this article, I believe you have understood how to use PHP scripts to upload files in a Linux environment. Hope this article helps you!

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