百度车牌识别demo

function get_token(){
    $url = 'https://aip.baidubce.com/oauth/2.0/token';
    $post_data['grant_type']       = 'client_credentials';
    $post_data['client_id']      = 'your key';
    $post_data['client_secret'] = 'your secret';
    $o = "";
    foreach ( $post_data as $k => $v ) 
    {
        $o.= "$k=" . urlencode( $v ). "&" ;
    }
    $post_data = substr($o,0,-1);    
    $res = request_post($url, $post_data);
    return $res["access_token"];
    //print_r($res);
    //$access_token=$res["access_token"];
}

/**
* 发起http post请求(REST API), 并获取REST请求的结果
* @param string $url
* @param string $param
* @return - http response body if succeeds, else false.
*/
function request_post($url = '', $param = ''){
    if (empty($url) || empty($param)) {
        return false;
    }
    $postUrl = $url;
    $curlPost = $param;
    // 初始化curl
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $postUrl);
    curl_setopt($curl, CURLOPT_HEADER, 0);
    // 要求结果为字符串且输出到屏幕上
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
    // post提交方式
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $curlPost);
    // 运行curl
    $data = curl_exec($curl);
    curl_close($curl);
    return $data;
}

function get_chepai($img_path,$tk){ 
$url = 'https://aip.baidubce.com/rest/2.0/ocr/v1/license_plate?access_token=' . $tk;
$img = file_get_contents($img_path);
$img = base64_encode($img);
$bodys = array(
    'image' => $img    
);
$res = request_post($url, $bodys) ;
return $res;
}



$img_path='./chepai/6.jpg';
$tk=get_token();


$res=get_chepai($img_path,$tk);
$res_json=json_decode(get_chepai($img_path,$tk), true, 512 , JSON_BIGINT_AS_STRING);//防止大数值转变成float类型

$car_num=$res_json["words_result"]["number"];
$car_clolor=$res_json["words_result"]["color"];
$car_real=$res_json["words_result"]["probability"];
$car_log=$res_json["log_id"];
echo floor($car_real[0]*100)/100;
echo $car_log;
var_dump($res_json);
print_r($res);