图片裁剪

业务说明:由于ios最大支持2048 * 2048的图片 ,目前系统中有很多超长的图片 因此需要进行裁剪，而且要修改数据库中一个json格式的字段，需要在长图的位置删除原对象紧接着插入分割后的图片地址

//图片分割 ios 图片不要超过 2048
private function excisionImage(Good $good, $storagePath)
{
    $imgListJson = json_decode($good->getAttributes()['image_list'], true);//$image->image_list;
    $willToChange = [];
    foreach ($imgListJson as $key => $item) {
        if($imgUrl = $item['url']) {
            //构造路径
            $filePath = str_replace('storage', $storagePath, $imgUrl);
            //获取图片信息用于判断
            if(file_exists($filePath)) {
                $arrPath = pathinfo($filePath);
                $path = $arrPath['dirname'];
                $fileName = $arrPath['filename'];
                $extName = $arrPath['extension'];
                list($width, $height, $type, $attr) = getimagesize($filePath);

                if($height > self::IMAGE_LENGTH) {
                    if($type == IMAGETYPE_JPEG) {
                        $funExt = 'jpeg';//imagecreatefromjpeg($filePath)
                    } elseif($type == IMAGETYPE_PNG) {
                        $funExt = 'png';
                    } elseif($type == IMAGETYPE_GIF) {
                        $funExt = 'gif';
                    }
                    $funCreate = "imagecreatefrom{$funExt}";
                    $img = $funCreate($filePath);
                    $maxW = $width;
                    $maxH = self::IMAGE_LENGTH;
                    $funImg = "image{$funExt}";
                    $arrImgFg = [];
                    for ($i = 0; $i < ceil($height / $maxH); $i++) {
                        $newfile = "{$path}/{$fileName}_{$i}." . $extName;
                        if ($i == (ceil($height / $maxH) - 1)) {
                            $maxHx = $height - $maxH * $i;
                            $iOut = @imagecreatetruecolor($maxW, $maxHx);
                        } else {
                            $iOut = @imagecreatetruecolor($maxW, $maxH);
                        }
                        imagecopy($iOut, $img, 0, 0, 0, $i * $maxH, $maxW, $maxH);
                        $funImg($iOut, $newfile);
                        $newPath = str_replace($storagePath, 'storage',  $newfile);
                        $arrImgFg[] = ['url' => $newPath, 'carousel' => 0];
                    }
                    $willToChange[$key] = $arrImgFg;
                    imagedestroy($img);
                }
            }
        }
    }

    $offset = 0;
    $arrKeyOffset = [];
    foreach ($willToChange as  $key => $imgList) {
        $arrKeyOffset[] = $key + $offset;
        array_splice($imgListJson, $key + 1 + $offset, 0, $imgList); // 插入到此位置 且删除0个
        $offset += count($imgList);
    }

    foreach ($arrKeyOffset as $key) {
        unset($imgListJson[$key]);
    }

    return $imgListJson;
}