How to implement the code of compressing images in equal proportions in php

The content of this article is about the code of how to compress images with equal proportions in PHP. It has a good reference value and I hope it can help friends in need.

/**
     * desription 压缩图片
     * @param sting $imgsrc 图片路径
     * @param string $imgdst 压缩后保存路径
     */
    public function compressedImage($imgsrc, $imgdst) {
        list($width, $height, $type) = getimagesize($imgsrc);
        
        $new_width = $width;//压缩后的图片宽
        $new_height = $height;//压缩后的图片高
                
        if($width >= 600){
            $per = 600 / $width;//计算比例
            $new_width = $width * $per;
            $new_height = $height * $per;
        }
        
        switch ($type) {
            case 1:
                $giftype = check_gifcartoon($imgsrc);
                if ($giftype) {
                    header('Content-Type:image/gif');
                    $image_wp = imagecreatetruecolor($new_width, $new_height);
                    $image = imagecreatefromgif($imgsrc);
                    imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
                    //90代表的是质量、压缩图片容量大小
                    imagejpeg($image_wp, $imgdst, 90);
                    imagedestroy($image_wp);
                    imagedestroy($image);
                }
                break;
            case 2:
                header('Content-Type:image/jpeg');
                $image_wp = imagecreatetruecolor($new_width, $new_height);
                $image = imagecreatefromjpeg($imgsrc);
                imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
                //90代表的是质量、压缩图片容量大小
                imagejpeg($image_wp, $imgdst, 90);
                imagedestroy($image_wp);
                imagedestroy($image);
                break;
            case 3:
                header('Content-Type:image/png');
                $image_wp = imagecreatetruecolor($new_width, $new_height);
                $image = imagecreatefrompng($imgsrc);
                imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
                //90代表的是质量、压缩图片容量大小
                imagejpeg($image_wp, $imgdst, 90);
                imagedestroy($image_wp);
                imagedestroy($image);
                break;
        }
    }

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