DyImg.php

<?php
class DyImg
{
    /**
     * Describe:压缩图
     * @Author: Bygones
     * Date: 2019-06-16
     * Time: 00:04
     * @param string $imgsrc
     * @param string $imgdst
     * @return string
     */
    public function compressedImage(string $imgsrc, string $imgdst) {
        list($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) {
                    $image_wp = imagecreatetruecolor($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);
                }
                ob_end_flush();
                break;
            case 2:
                $image_wp = imagecreatetruecolor($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);
                ob_end_flush();
                break;
            case 3:
                $image_wp = imagecreatetruecolor($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;
        }
        return $imgdst;
    }
}