Thinkphp6框架实现上传图片压缩

//首先封装一个图片类
<?php


/**
图片压缩操作类
 */
namespace Img;


class Compression{






    private $src;//图片路径


    private $imageinfo;


    private $image;


    public  $percent = 0.5;//压缩比[0.5较为合适]


    public function __construct($src){


        $this->src = $src;


    }


    /**


    打开图片


     */


    public function openImage(){






        list($width, $height, $type, $attr) = getimagesize($this->src);


        $this->imageinfo = array(


            'width'=>$width,


            'height'=>$height,


            'type'=>image_type_to_extension($type,false),


            'attr'=>$attr


        );


        $fun = "imagecreatefrom".$this->imageinfo['type'];


        $this->image = $fun($this->src);


    }


    /**


    操作图片


     */


    public function thumpImage(){






        $new_width = $this->imageinfo['width'] * $this->percent;


        $new_height = $this->imageinfo['height'] * $this->percent;


        $image_thump = imagecreatetruecolor($new_width,$new_height);


//将原图复制带图片载体上面，并且按照一定比例压缩,极大的保持了清晰度


        imagecopyresampled($image_thump,$this->image,0,0,0,0,$new_width,$new_height,$this->imageinfo['width'],$this->imageinfo['height']);


        imagedestroy($this->image);


        $this->image = $image_thump;


    }


    /**


    输出图片


     */


    public function showImage(){






        header('Content-Type: image/'.$this->imageinfo['type']);


        $funcs = "image".$this->imageinfo['type'];


        $funcs($this->image);






    }


    /**


    保存图片到硬盘


     */


    public function saveImage($name){


        if(empty($name)) return false;
        $allowImgs = ['.jpg', '.jpeg', '.png', '.bmp', '.wbmp','.gif'];  //如果目标图片名有后缀就用目标图片扩展名 后缀，如果没有，则用源图的扩展名
        $dstExt = strrchr($name ,".");
        $sourseExt = strrchr($this->src ,".");
        if(!empty($dstExt)) $dstExt =strtolower($dstExt);
        if(!empty($sourseExt)) $sourseExt =strtolower($sourseExt);
        //有指定目标名扩展名
        if(!empty($dstExt) && in_array($dstExt,$allowImgs)){
            $dstName = $name;
        }elseif(!empty($sourseExt) && in_array($sourseExt,$allowImgs)){
            $dstName = $name.$sourseExt;
        }else{
            $dstName = $name.$this->imageinfo['type'];
        }


        $funcs = "image".$this->imageinfo['type'];


        $funcs($this->image,$dstName);






    }


    /**


    销毁图片


     */


    public function __destruct(){


        imagedestroy($this->image);


    }






}

<?php


//使用tp6自带上传实现图片压缩
//可实现6mb图上传得到200kb高清压缩图
public function test(Request $request){


        // 获取表单上传文件 例如上传了001.jpg
        $file = request()->file('file');
        // 上传到本地服务器
        $fileName = Filesystem::putFile('upload/api/img', $file);
        $src = config('app.url').$fileName;
        //$src = 'http://pic1.win4000.com/wallpaper/b/57c79dd38f0cb_270_185.jpg';
        //后缀
        $ext = substr(strrchr($src, '.'), 1);
        //压缩
        $image = new Img\Compression($src);
        $image->openImage();
        $image->thumpImage();
        $new_file_name = md5(mt_rand(100000,9999999));
        $image->saveImage('./upload/api/img/'.date('Ymd').'/'.$new_file_name);
        unlink($fileName);//删除原图


        $res = config('app.url').'api/img/'.date('Ymd').'/'.$new_file_name.'.'.$ext;


        return $this->success($res);


    }