How to write a simple file management system using PHP

How to use PHP to write a simple file management system

Preface:
With the rapid development of the Internet, various files that we come into contact with in our daily lives As the number of files grows, it becomes more important to manage these files effectively. As a commonly used server-side scripting language, PHP can help us build a simple and efficient file management system. This article will introduce in detail how to use PHP to write a file management system with basic functions and provide specific code examples.

1. Build a basic environment
Before we start writing the file management system, we need to build a basic development environment. The specific steps are as follows:

1. Install PHP and Web server (such as Apache or Nginx): Choose the appropriate version according to your operating system and make sure the installation is successful.
2. Create a project directory: Create a new folder in the root directory of the Web server to store related files of the file management system.
3. Configure the Web server: Configure the project directory as the virtual host of the Web server and ensure that PHP is parsed correctly.

2. Writing the file upload function
One of the core functions of the file management system is file upload. The following is a simple file upload code example:

<?php
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $uploadDir = 'uploads/'; // 设置上传文件保存的目录

    if (!file_exists($uploadDir)) {
        mkdir($uploadDir, 0777, true); // 创建目录
    }
    
    $fileName = $_FILES['file']['name'];
    $fileTmpName = $_FILES['file']['tmp_name'];
    $fileDestination = $uploadDir . $fileName;

    move_uploaded_file($fileTmpName, $fileDestination);
    echo '文件上传成功！';
}
?>

<form method="POST" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit" value="上传">
</form>

The above code moves the uploaded file to the specified directory through the move_uploaded_file function. You can modify the value of $uploadDir according to actual needs to set the path to save the file, and add other related input items in the front end.

3. Write a file list display function
Next, we need to write a file list display function to facilitate users to view uploaded files. The following is a simple file list display code example:

<?php
$uploadDir = 'uploads/';

$files = scandir($uploadDir);
foreach ($files as $file) {
    if ($file !== '.' && $file !== '..') {
        echo '<a href="' . $uploadDir . $file . '">' . $file . '</a><br>';
    }
}
?>

The above code uses the scandir function to traverse the files in the specified directory and output the file names through a loop. You can specify the directory where the files to be displayed are located by modifying the value of $uploadDir.

4. Writing a file download function
In order to increase the practicality of the file management system, we also need to write a file download function so that users can easily download uploaded files. The following is a simple file download code example:

<?php
$filepath = 'uploads/file.pdf'; // 指定需要下载的文件路径

if (file_exists($filepath)) {
    header('Content-Type: application/octet-stream');
    header('Content-Disposition: attachment; filename="' . basename($filepath) . '"');
    readfile($filepath);
}
?>

The above code tells the browser that the file is to be downloaded rather than opened directly by setting HTTP header information. You need to change the value of $filepath to the actual path of the file to be downloaded, such as 'uploads/file.pdf'.

Conclusion:
Through the above simple code examples, you can initially build a simple file management system based on PHP. Of course, this is just a basic version and you can extend and optimize it according to your needs. I hope this article can be helpful to your study and practice!

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