迅睿CMS压缩图片变大的解决方法

结果分析迅睿CMS代码发现压缩图片的方法保留了最高质量造成图片文件大小变大的原因，我们只需要找到文件dayrui/Fcms/Library/Image.php中的reduce方法替换压缩质量的值即可，最终实现代码参考如下：

public function reduce($imgsrc, $cw) {

        list($width, $height, $type) = getimagesize($imgsrc);
        list($width, $height) = $this->_fix_orientation($imgsrc, $width, $height);
        if ($type != 18 && strpos($imgsrc, '.webp')) {
            $type = 18;
        }

        if ($width > $cw) {
            $per = $cw / $width;//计算比例
            $new_width = floor($width * $per); //压缩后的图片宽
            $new_height = floor($height * $per); //压缩后的图片高
            switch ($type) {
                case 1:
                    // gif
                    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, $height);
                    //75代表的是质量、压缩图片容量大小
                    imagejpeg($image_wp, $imgsrc, 75);
                    imagedestroy($image_wp);
                    imagedestroy($image);
                    break;
                case 3:
                    header('Content-Type:image/png');
                    $image_wp = imagecreatetruecolor($new_width, $new_height);
                    $image = imagecreatefrompng($imgsrc);

                    //2.上色
                    $color=imagecolorallocate($image_wp,255,255,255);
                    //3.设置透明
                    imagecolortransparent($image_wp,$color);
                    imagefill($image_wp,0,0,$color);

                    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, $imgsrc, 75);
                    imagepng($image_wp, $imgsrc, 6);
                    imagedestroy($image_wp);
                    imagedestroy($image);
                    break;
                case 18:
                    header('Content-Type:image/webp');
                    $image_wp = imagecreatetruecolor($new_width, $new_height);
                    if (!function_exists('imagecreatefromwebp')) {
                        $image = imagecreatefromjpeg($imgsrc);
                    } else {
                        $image = imagecreatefromwebp($imgsrc);
                    }
                    imagecopyresampled($image_wp, $image, 0, 0, 0, 0, $new_width, $new_height, $width, $height);
                    //80代表的是质量、压缩图片容量大小
                    imagewebp($image_wp, $imgsrc, 80);
                    imagedestroy($image_wp);
                    imagedestroy($image);
                    break;
            }
        } else {
            CI_DEBUG && log_message('debug', '系统要求宽度>'.$cw.'px才进行压缩处理，当前图片宽度='.$width.'，不满足压缩条件：'.$imgsrc);
        }

        return;
    }