<?php

/**
 * @Author: fm453
 * @Date:   2018-08-17 19:39:41
 * @Last Modified by:   fm453
 * @Last Modified time: 2019-01-12 12:13:35
 * @Email: fm453@lukegzs.com
 */
namespace backend\controllers;

use Yii;
use yii\data\Pagination;
use yii\helpers\Url;

class AttachController extends \yii\web\Controller
{
    public $enableCsrfValidation = false;   //取消csrf令牌验证；
    //主界面
    public function actionIndex()
    {
        $request = Yii::$app->request;
        $get = $request->get();
        $img = Urldecode($get['img']);
        $file = Yii::getAlias("@upload").$img;
        $img = file_get_contents($file);
        $this->showImg($file);
    }

    /*
     * php 页面直接输出图片
     */
    function showImg($img){
        $info = getimagesize($img);
        $imgExt = image_type_to_extension($info[2], false); //获取文件后缀
        $fun = "imagecreatefrom{$imgExt}";
        $imgInfo = $fun($img);         //1.由文件或 URL 创建一个新图象。如:imagecreatefrompng ( string $filename )
        $mime = $info['mime'];
        header('Content-Type:'.$mime);
        $quality = 100;
        if($imgExt == 'png') $quality = 9;   //输出质量,JPEG格式(0-100),PNG格式(0-9)
        $getImgInfo = "image{$imgExt}";
        $getImgInfo($imgInfo, null, $quality); //2.将图像输出到浏览器或文件。如: imagepng ( resource $image )
        //TBD: PNG图片会显示其被修改前的原始文件，与直接用SRC引用的方法有所不同
        imagedestroy($imgInfo);
    }

    /*图片转换为 base64格式编码*/
    function base64EncodeImage ($image_file) {
        $base64_image = '';
        $image_info = getimagesize($image_file);
        $image_data = fread(fopen($image_file, 'r'), filesize($image_file));
        $base64_image = 'data:' . $image_info['mime'] . ';base64,' . chunk_split(base64_encode($image_data));
        return $base64_image;
    }

}