Detailed explanation of how Laravel handles file upload function

Laravel is a popular PHP framework that provides many useful libraries and tools, including file upload functionality. In this article, we will explore how Laravel handles file uploads.

1. Configuration

Laravel uses a configuration file to handle file uploads. This file is stored in config/filesystems.php. By default, this file contains a local disk configuration for storing uploaded files in the local file system. If you wish to use cloud storage (such as Amazon S3), you can add the appropriate configuration.

2. Form

File upload begins with an HTML form. Before your data can be transferred, the form must be constructed correctly. To upload a file, you need to add a file input field to the form. This can be accomplished using the HTML element.

@csrf
<input type="file" name="photo">
<input type="submit" value="upload">

3. Controller

When the user submits the form, Laravel sends the form data to the method of the corresponding controller defined in the route. Process the uploaded file in the controller and save it in the specified location.

public function upload(Request $request)
{

$request->validate([
    'photo' => 'required|image|mimes:jpeg,png,jpg,gif,svg|max:2048',
]);

$photo = $request->file('photo');
$fileName = time() . '_' . $photo->getClientOriginalName();
$path = $photo->storeAs('uploads', $fileName, 'public');
return $path;

}

In the above code, the file upload controller receives the request object and then uses validate( ) method to verify uploaded files. To do this, check if the file is required and if it is an image file. If everything goes well, Laravel moves the file to the specified directory and changes its name to a combination of timestamp and original filename.

4. View

After you complete these operations, you can link the uploaded file into a view file to allow users to view it. You can use Laravel's asset() function to build file URL links.

This input will generate a URL pointing to the uploaded image, which is served by Laravel's public disk. The default storage path of public disk is storage/app/public/uploads. However, you must first create a soft link to this path. To create the link, run the following Artisan command.

php artisan storage:link

5. Summary

Laravel is a very popular PHP framework that provides powerful tools and libraries for Handle file uploads. Its documentation and community provide a wealth of information and resources to help you successfully implement file upload functionality.

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