Decode base64 into jpeg and save the image to server - yii

Question

currently i have base 64 value in
$model->test
and i want to decode the base 64 value in controller and save it to database through API here some of my code in controller
i try to decode and cant figure out how to upload it to server and create path
however i try to to pass the $data to getinstance which is not working
public function doSaveStudent(StudentLoanForm $model)
{
$url = API_URL . 'web/apply/student';
$data1 = $model->test;
$decode = base64_decode($data);
$img = file_put_contents('webcam.jpg', $data);
$model->doUploads();
$ktpdetail = UploadedFile::getInstance($model, 'image_ktp');
$data = null;
$data = [
[
'name' => 'univ_name',
'contents' => $model->univ_name
],
[
'name' => 'test',
'contents' =>$model->test
],
];
// dd($model->test);
if ($ktpdetail != null) {
$data[] = [
'name' => 'image_ktp',
'contents' => fopen(Yii::getAlias('#frontend/web/') . $model->image_ktp, 'r'),
'filename' => $ktpdetail->getBaseName() . '.' . $ktpdetail->getExtension()
];
}
if($ktpayahdetail != null){
$data[] = [
'name' => 'foto_ktp_ayah',
'contents' => fopen(Yii::getAlias('#frontend/web/') . $model->foto_ktp_ayah, 'r'),
'filename' => $ktpayahdetail->getBaseName() . '.' . $ktpayahdetail->getExtension()
];
}
if ($kkdetail != null) {
$data[] = [
'name' => 'image_kk',
'contents' => fopen(Yii::getAlias('#frontend/web/') . $model->image_kk, 'r'),
'filename' => $kkdetail->getBaseName() . '.' . $kkdetail->getExtension()
];
i expect to decode the base 64 and upload all the value using yii2 best practice

Answer 1

The yii\web\UploadedFile is used only for files uploaded using file input in forms.
In your case base64_decode($model->test) should give you binary data of image.
Then you have two options what to do with them.
1) You can store them directly into BLOB attribute in database.
$imageModel = new MyImageModel();
$imageModel->data = base64_decode($model->test);
if(!$imageModel->save()) {
throw new \yii\base\Exception("Couldn't save file to db");
}
2) You can save the file with file_put_contents and then store the path to file in your model.
$imageData = base64_decode($model->test);
//the used alias in path is only example.
//The datetime and random string are used to avoid conflicts
$filename = Yii::getAlias(
'#frontend/web/' . date('Y-m-d-H-i-s') .
Yii::$app->security->generateRandomString(5) . '.jpg'
);
if (file_put_contents($filename, $imageDate === false) {
throw new \yii\base\Exception("Couldn't save image to $filename");
}
$imageModel = new MyImageModel();
$imageModel->path = $filename;
if(!$imageModel->save()) {
//delete file if we couldn't save path into db to prevent creating an orphan
unlink($filename);
throw new \yii\base\Exception("Couldn't add $filename to database");
}