backend/components/ImageResizer.php

<?php
namespace backend\components;
use yii\web\UploadedFile;
use backend\models\ImageSizerForm;
use yii\base\Widget;
use Imagine\Image\Box;
use yii\imagine\Image;
use Yii;
use Imagine\Gd\Imagine;
class ImageResizer extends Widget
{
    public $height;
    public $width;
    public function init(){
        parent::init();
    }
    public function run(){
        $model = new ImageSizerForm();
        $request = Yii::$app->request->post();
        if ($request) {
            if(isset($request['old_img'])){
                $this->deleteImages($request['old_img']);
            }
            $model->file = UploadedFile::getInstance($model, 'file');
            if(!$model->file){
                return json_encode(["error"=>"Не указан файл"]);
            }
            $md5_file = md5_file($model->file->tempName);
            $imgDir = Yii::getAlias('@storage/'.$md5_file.'/');
            $imageOrigAlias = Yii::getAlias($imgDir.'original'.'.'.$model->file->extension);
            if(!is_dir($imgDir)) {
                mkdir($imgDir, 0755, true);
            }
            $model->file->saveAs($imageOrigAlias);
            if($request['width'] && $request['height']){
                $imageAlias = Yii::getAlias($imgDir.$request['width'].'x'.$request['height'].'.'.$model->file->extension);
                $imageLink = '/storage/'.$md5_file.'/'.$request['width'].'x'.$request['height'].'.'.$model->file->extension;
                $this->resizeImg($request['width'],$request['height'], $imageOrigAlias,$imageAlias);
            } else {
                $imageLink = '/storage/'.$md5_file.'/'.'original'.'.'.$model->file->extension;
            }
            if($model->multi){
//                $view = $this->renderPartial('@app/components/views/_gallery_item', [
//                    'item' => ['image'=>$imageLink],
//                ]);
//
//                return json_encode(['link'=>$imageLink, 'view' =>$view]);
            } else {
                $p1[0] = "<img style='height:160px' src='$imageLink' class='file-preview-image'>";
                return json_encode(['success','initialPreview' => $p1, 'append' => false, 'name' =>$imageLink,]);
            }
        } else {
            return json_encode(['error']);
        }
    }
    public function isBigger($width,$height,$w,$h)
    {
        if($width>$w){
            return true;
        }else if($height >$h) {
            return true;
        }
        return false;
    }
    public function resizeImg($w, $h, $imageAlias,$imageAliasSave)
    {
        $img = Image::getImagine()->open(Yii::getAlias($imageAlias));
        $size = $img->getSize();
        $width = $size->getWidth();
        $height = $size->getHeight();
        $e_width = $w/$h;
        $e_height = $h/$w;
        $e1_width = $width/$height;
        $e1_height = $height/$width;
        if($this->isBigger($width,$height,$w,$h)){
            if($e_width<$e1_width){
                $new_width = $width*($e_width/$e1_width);
                $width = $new_width;
            }else {
                $new_height = $height*($e_height/$e1_height);
                $height = $new_height;
            }
        } else {
            $img->save($imageAliasSave, array('flatten' => false));
            return true;
        }
        Image::crop($imageAlias, $width, $height,[0,0])
            ->save(Yii::getAlias($imageAliasSave), ['quality' =>
                100]);
        $imagine = new Imagine();
        $imagine->open($imageAliasSave)
            ->resize(new Box($w, $h))
            ->save($imageAliasSave, array('flatten' => false));
    }
    private function deleteImages($old_img){
        if(!empty($old_img) && file_exists($_SERVER['DOCUMENT_ROOT'].$old_img)){
            $rootDir = explode("/", $old_img);
            $row = $_SERVER['DOCUMENT_ROOT'].'/'.$rootDir[1].'/'.$rootDir[2].'/';
            $allFiles = scandir($row);
            $allFiles = array_slice($allFiles, 2);
            foreach($allFiles as $oldFile){
                unlink($row.$oldFile);
            }
        }
    }
    public function actionDeleteImage(){
        $old_img = Yii::$app->request->post('old_img');
        if ($old_img) {
            $this->deleteImages($old_img);
        }
    }
}