Souke/common/helpers/Upload.php

<?php

/*
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 */

namespace common\helpers;

use yii\web\UploadedFile;
use Yii ;

class Upload {

    public static function uploadFile($model, $champs, $filename_old = '') {
        $file = UploadedFile::getInstance($model, $champs);
        if ($file) {
            $file_name = $file->baseName . '-' . uniqid() ;
            $file_name_extension = $file_name .'.'.$file->extension ;
            $dir_file = '../../frontend/web/uploads/' ;
            $path_file = $dir_file . $file_name_extension ;
            $file->saveAs($path_file);
            
            // resize image
            list($width, $height, $type, $attr) = getimagesize($path_file);
            if($width > 500)
            {
                $image = Yii::$app->image->load($path_file);
                
                // big
                if($width > 1600)
                {
                    $image->resize(1600)
                          ->save($dir_file . $file_name . '-big.'.$file->extension);
                }
                
                // medium
                if($width > 1024)
                {
                    $image->resize(1024)->save($dir_file . $file_name_extension) ;
                    $image->save($dir_file . $file_name . '-medium.'.$file->extension);
                       
                       
                }
                
                // small
                if($width > 500)
                {
                    $image->resize(500)
                       ->save($dir_file . $file_name . '-small.'.$file->extension);
                }
            }
            
            $model->$champs = $file_name_extension ;
        } else {
            $model->$champs = $filename_old;
        }

        $model->save();
    }

}