How can I check the size of the file uploaded via the form?

Question

I have a simple form on the website:

<form method="POST" enctype="multipart/form-data">
{{ csrfInput() }}
{{ actionInput('families/families/start') }}

<input type="file" name="img" value="">

<input type="submit" value="go">
</form>

And there is a controller:

<?php
namespace modules\families\controllers;

use Craft;
use craft\web\Controller;
use craft\elements\Asset;
use craft\helpers\Assets;
use craft\web\UploadedFile;
use craft\elements\Entry;

class FamiliesController extends Controller
{

    protected array|bool|int $allowAnonymous = true;

    public function actionStart() {

        $uploadedFile = UploadedFile::getInstanceByName('img');
        $tempPath = $uploadedFile->saveAsTempFile();

        $volume = Craft::$app->getVolumes()->getVolumeByHandle('uploads');
        $folder = Craft::$app->getAssets()->ensureFolderByFullPathAndVolume('family-photos', $volume, false);

        $asset = new Asset();
        $asset->newFolderId = $folder->id;
        $asset->volumeId = $volume->id;
        $asset->tempFilePath = $tempPath;
        $asset->setFilename(Assets::prepareAssetName($uploadedFile->name)); 
        $asset->avoidFilenameConflicts = true;
        $asset->setScenario(Asset::SCENARIO_CREATE);

        Craft::$app->elements->saveElement($asset);


    }
}

How can I check the uploaded file for its weight and notify the user that his file is too large? I would not like to allow users to upload files that weigh more than 2 megabytes

Answer 1

You can check the size property on the UploadedFile instance.

$limit = 2_097_152;
if ($uploadedFile->size > $limit) {
    // abort and return an error message
}