使用腾讯AI开放平台api进行车牌OCR识别和其他比如图片文字识别等通用

此方法通用OCR的功能请求，不同的是功能请求接口，按照自己所需换一个接口地址即可：

 $app_id,
'nonce_str'=>uniqid("{$app_id}_"),
'time_stamp'=>time()
);
//读取待识别图片
// $image_data = file_get_contents('./20190517203050.png');
//编码后加入到请求参数中
// $params['image'] = base64_encode($image_data);
$params['image'] = '/9j/4AAQSkZJRgABAQAAAQABAAD/2wBDAAUEBAQEAwUEBAQGBQUGCA0ICAcHCBALDAkNExAUExIQ
EhIUFx0ZFBYcFhISGiMaHB4fISEhFBkkJyQgJh0gISD/2wBDAQUGBggHCA8ICA8gFRIVICAgICAg
ICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICD/wgARCAGQAZADAREA
AhEBAxEB/8QAHQAAAgIDAQEBAAAAAAAAAAAAAQIAAwQFBgcICf/EABoBAQEBAQEBAQAAAAAAAAAA
AAACAQMEBQb/2gAMAwEAAhADEAAAANceJSp