Handling file uploads in Slim 3 is reasonably easy as it uses the PSR-7 Request object, so let’s take a look.
The easiest way to get a Slim framework project up and running is to use the Slim-Skeleton to create a project:
composer create-project slim/slim-skeleton slim3-file-uploads
and then you can cd into the directory and run the PHP built-in web server using:
php -S 0.0.0.0:8888 -t public public/index.php
Displaying the form
We can now create a simple form, firstly by setting up the / route in src/routes.php:
$app->get('/', function ($request, $response, $args) {
// Render file upload form
return $this->renderer->render($response, 'index.phtml', $args);
});
The view script, templates/index.html contains the form:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Slim 3</title>
<link rel="stylesheet" href="http://yegor256.github.io/tacit/tacit.min.css">
</head>
<body>
<h1>Upload a file</h1>
<form method="POST" action="/upload" enctype="multipart/form-data">
<label>Select file to upload:</label>
<input type="file" name="newfile">
<button type="submit">Upload</button>
</form>
</body>
</html>
Handling the upload
We now need to write the route that handles the uploaded file. This goes in src/routes.php:
$app->post('/upload', function ($request, $response, $args) {
$files = $request->getUploadedFiles();
if (empty($files['newfile'])) {
throw new Exception('Expected a newfile');
}
$newfile = $files['newfile'];
// do something with $newfile
});
The file upload in $_FILES is available from the $request‘s getUploadedFiles() method. This returns an array keyed by the name of the <input> element. In this case, that’s newfile.
The $newfile object is a instance of PSR-7’s UploadedFileInterface. Typical usage is to check that there is no error and then move the file to somewhere else. This is done like this:
if ($newfile->getError() === UPLOAD_ERR_OK) {
$uploadFileName = $newfile->getClientFilename();
$newfile->moveTo("/path/to/$uploadFileName");
}
There’s also other useful methods such as getClientMediaType() and getSize() if you need them.
Conclusion
As you can see, dealing with file uploads within a PSR-7 request is really easy!
Source: AKRABAT