common/behaviors/ShowImage.php

<?php
    namespace common\behaviors;
    use common\modules\file\components\UploaderComponent;
    use yii;
    use yii\base\Behavior;
    class ShowImage extends Behavior
    {
        /**
         * Resize image and return its path.
         *
         * @param string              $dir    Original image path
         * @param integer|string      $width  New image width
         * @param null|integer|string $height New image height, set NULL to save ratio
         *
         * @return string Resized image path
         * @throws \Exception
         */
        function minImg($dir, $width, $height = NULL)
        {
            if(empty( $dir )) {
                return '/images/imageNotFound.jpg';
            }
            if($width == 'original') {
                $preg = '/\/(.[^\/]*)$/';
                preg_match('/\.(.[^.]*)$/', $dir, $type);
                if(isset( $type[ 1 ] )) {
                    $dir = preg_replace($preg, '/original.' . $type[ 1 ], $dir);
                }
            } else {
                $preg = '/\/(.[^\/]*)$/';
                preg_match('/\.(.[^.]*)$/', $dir, $type);
                if(isset( $type[ 1 ] )) {
                    $dir = preg_replace($preg, '/' . $width . 'x' . $height . '.' . $type[ 1 ], $dir);
                    $storage = dirname(yii\helpers\Url::to('@storage'));
                    $filename = $storage . $dir;
                    if(!file_exists($filename)) {
                        $original = $storage . dirname($dir) . '/original.' . $type[ 1 ];
                        if(file_exists($original)) {
                            $resizer = new UploaderComponent();
                            $resizer->resizeImg($width, $height, $original, $filename);
                        } else {
                            throw new \Exception("Файл $original не существует");
                        }
                    }
                }
            }
            return $dir;
        }
        /**
         * @param string $array String to split
         *
         * @return array Array of image paths
         */
        function ShowGallery($array)
        {
            $gallery = explode(',', $array);
            if(is_array($gallery)) {
                array_splice($gallery, -1);
                return $gallery;
            } else {
                return [ ];
            }
        }
    }