PHP server development APP interface

This article introduces the development of APP interface on PHP server. Now I will share it with you. Friends who are interested can take a look.

1. Introduction to APP interface

What is app interface? The app interface is a script written in a server-side program such as PHP for the app client to request and obtain data. For example, the homepage of a store app must have some product lists, so when you open the app, the homepage encapsulated in the app will actually request a remote php file such as: http://www.example.com/index .php to obtain the product list data that needs to be displayed on the home page. When front-end engineers get this data, they will display the content according to a specific design.
This is the purpose of the interface. An app usually needs to access multiple PHP interfaces to obtain different data. Let's talk about the interface implementation process in detail and some core technologies needed to implement the interface.

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2. PHP interface knowledge

JSON and XML methods encapsulate the communication interface

response.class.php

<?php/**
 *description 用于返回指定数据格式的类
 *@param $code [int] 返回的状态码
 *@param $message [string] 返回的状态信息
 *@param $data [array] 需要返回的数据
 *
 */class Response{
    public function json($code,$message,$data){
        $result = array(                "code" => $code,                "message" => $message,                "data" => $data
            );        return json_encode($result);
    }    public function xml($code,$message,$data){
        $result = array(                "code" => $code,                "message" => $message,                "data" => $data
            );
        header(&#39;Content-Type:text/xml&#39;);        $xml = "<?xml version=&#39;1.0&#39; encoding=&#39;UTF-8&#39;?>\n";        $xml .= "<root>";        $xml .= self::encodeXml($result);        $xml .= "</root>";        return $xml;
    }    /**
     *将数据解析为XML字符串
     */

    public static function encodeXml($data){
        $attr = $xml = "";        foreach($data as $key => $value){                if(is_numeric($key)){                    $attr = " id=&#39;{$key}&#39;";                    $key = "item";
                }                $xml .= "<{$key}{$attr}>";                $xml .= is_array($value)?self::encodeXml($value):$value;                $xml .= "</$key>";
        }        return $xml;
    }
}

response.class.php It is the simplest class that returns data in json or XML format.
The interface file code is posted below:
returndata.php

<?phprequire "response.class.php";    //引入返回信息类//准备返回数据$code = 200;$message = "信息请求成功";$data = array(        "name" => "ruanwnewu",        "sex"  => "1",        "age"  => "28",        "exp" => array(                "2012" => "北京瑞泰新",                "2013" => "兄弟连",                "2014" => "木蚂蚁科技"
            )
    );//实例化response类$response = new Response;//返回数据echo $response -> json($code,$message,$data);

3. Actual development examples

• Develop three interfaces (login, registration, file upload) to complete the corresponding functions respectively

• Because I do not do APP development, during the actual interface testing process, use The RESTClient extension of the Firefox browser simulates APP requesting services and receiving data
  (1) Writing of login and registration interfaces
  Direct code:

<?phprequire ("../connect_db.php");$action = $_REQUEST["action"];$conn = db_connect();
mysql_query("set names &#39;utf8&#39;");
mysql_select_db("FECG");switch ($action){    case &#39;login&#39;:
       login();       break;    case &#39;register&#39;:
       register();       break;    case &#39;upload&#39;:
       upload();       break;    default:       break;
}//登录接口function login(){
    $account_name = $_POST["username"];    $password = $_POST["password"];    $result = mysql_query("SELECT * FROM app_account WHERE account_name=&#39;".$account_name."&#39;");    if (mysql_num_rows($result) > 0){        $row = mysql_fetch_array($result);        $salt = $row["salt"];        $new_password = md5($password."".$salt);        if ($new_password == $row["password"]){            //登录成功
            $current_time = new DateTime();            $login_time = $current_time -> format(&#39;Y-m-d H:i:s&#39;);            $result =  mysql_query("UPDATE app_account SET last_lgin_time=&#39;".$login_time."&#39; WHERE account_name=&#39;".$row[&#39;account_name&#39;]."&#39;");            $array = array();            $array["account_id"] = $row["account_id"];            $array["account_name"] = $row["account_name"];            $array["create_time"] = $row["creat_time"];            $json = json_encode(array(                  "resultCode"=>200,                  "message"=>"login successed!",                  "data"=>$array));            echo($json);
        }else{            $json = json_encode(array(                  "resultCode"=>500,                  "message"=>"The password is wrong!please try again."
                  ));            echo($json);
         }
    }else{        //登录失败
        $json = json_encode(array(              "resultCode"=>500,              "message"=>"please register!"
              ));        echo($json);
    }
}//注册接口function register(){
    $account_name = $_POST["username"];    $password = $_POST["password"];    $result = mysql_query("select * from app_account where account_name=&#39;".$account_name."&#39;");    //查询失败
    if (!$result){        $json = json_encode(array(              "resultCode"=>500,              "message"=>"select failed!"
              ));        echo($json);
    }    //用户名已经注册
    if (mysql_num_rows($result) > 0){        $json = json_encode(array(              "resultCode"=>500,              "message"=>"register failed!"
              ));        echo($json);
    }else{        //插入记录到数据库中
        $account_id = uniqid();        $salt = uniqid();        $new_password = md5($password."".$salt);        $current_time = new DateTime();        $create_time = $current_time -> format(&#39;Y-m-d H:i:s&#39;);        $last_login_time = $create_time;        $result = mysql_query("insert into app_account(account_id,account_name,password,salt,creat_time,last_lgin_time) values(&#39;".$account_id."&#39;, &#39;".$account_name."&#39;, &#39;".$new_password."&#39;, &#39;".$salt."&#39;, &#39;".$create_time."&#39;, &#39;".$last_login_time."&#39;)");        $user_id = uniqid();        $result1 = mysql_query("INSERT INTO app_user(user_id,username,account_id) VALUES(&#39;".$user_id."&#39;, &#39;".$account_name."&#39;, &#39;".$account_id."&#39;)");        if ($result){           $json = json_encode(array(                 "resultCode"=>200,                 "message"=>"register successed!"
                 ));           echo($json);
        }
    }
}//文件上传接口function upload(){}?>

RESTClient test:

(Registration is a similar operation)
(2) File upload
Because it is a simulation, and the file upload interface involves file upload, RESTClient cannot simulate it. So write a separate client uploadClient.html to simulate file upload.
uploadClient.html

<!DOCTYPE html><html><head>
    <title>文件上传</title>
    <meta charset="UTF-8" /></head><body><form action="upload.php" method="post" enctype="multipart/form-data" >
    选择文件：<input type="file" name="filename" />
    </br>
    用户ID：<input type="text" name="userid" /></br>
    心率：<input type="text" name="rate" /></br>
    <input type="submit" value="提交"></form></body></html>

The server receives the file interface upload.php
upload.php

<?phprequire ("../connect_db.php");$conn = db_connect();
mysql_query("set names &#39;utf8&#39;");
mysql_select_db("FECG");$file_name = $_POST["filename"];$userid = $_POST["userid"];$heart_rate = $_POST["rate"];if ($_FILES[&#39;filename&#39;][&#39;name&#39;] != NULL){    if ($_FILES[&#39;filename&#39;][&#39;error&#39;]){        $data = array(            "resultCode"=>1,            "message"=>"失败，上传文件出错!"
        );        echo json_encode($data);
    }    else{        //获取文件后缀名
        $file_extension = substr(strrchr($_FILES[&#39;filename&#39;][&#39;name&#39;], &#39;.&#39;), 1);        //判断文件夹是否存在
        $path = "/var/www/html/FECG/fecg_segment_data/".$userid;        if (!file_exists($path)){            //创建以用户名命名的文件夹
            if(mkdir ($path)){               $data = array("message"=>"ok");               echo json_encode($data);}
        }        //对上传文件进行命名
        $file_path = &#39;/var/www/html/FECG/fecg_segment_data/&#39;.$userid.&#39;/&#39;.date("YmdHis").".".$file_extension;        if (is_uploaded_file($_FILES[&#39;filename&#39;][&#39;tmp_name&#39;])){            $result = move_uploaded_file($_FILES[&#39;filename&#39;][&#39;tmp_name&#39;], $file_path);            if ($result){                //文件上传成功，进行第二步更新数据库
                $result = mysql_query("SELECT * FROM app_account WHERE account_name=&#39;".$userid."&#39;");                if (!$result){                     $num = 123;                     $data = array(                        "resultCode"=>2,                        "message"=>"userid",                        "data"=>$userid
                     );                     echo json_encode($data);
                }                $row = mysql_fetch_array($result, MYSQL_ASSOC);                $account_id = $row["account_id"];                $result1 = mysql_query("SELECT * FROM app_user WHERE account_id=&#39;".$account_id."&#39;");                $row1 = mysql_fetch_array($result1, MYSQL_ASSOC);                $user_id = $row1["user_id"];                $user_name = $row1["username"];                $ecg_segment_id = uniqid();                $channel = 3;                $current_time = new DateTime();                $create_time = $current_time -> format(&#39;Y-m-d H:i:s&#39;);                $result = mysql_query("INSERT INTO ecg_segment(ecg_segment_id,channel,heart_rate,ecg_url,user_name,user_id)
                                      VALUES(&#39;".$ecg_segment_id."&#39;, &#39;".$channel."&#39;, &#39;".$heart_rate."&#39;, &#39;".$file_path."&#39;, &#39;".$user_name."&#39;, &#39;".$user_id."&#39;)");                $task_id = uniqid();                $server_analysis = "异常";                $result1 = mysql_query("INSERT INTO task(task_id,creat_time,server_analysis,ecg_segment_id)
                                      VALUES(&#39;".$task_id."&#39;, &#39;".$create_time."&#39;, &#39;".$server_analysis."&#39;, &#39;".$ecg_segment_id."&#39;)");                if ($result){                    $data = array(                        "resultCode"=>2,                        "message"=>"文件上传成功!"
                        );                    echo json_encode($data);
                }                else{                    $data = array(                        "resultCode"=>3,                        "message"=>"服务器错误!"
                        );                    echo json_encode($data);
                }
            }            else{                $data = array(                    "resultCode"=>4,                    "message"=>"uploaded failed!"
                    );                echo json_encode($data);
            }
        }        else{            $data = array(                "resultCode"=>5,                "message"=>"文件上传失败!"
            );            echo json_encode($data);
        }
    }
}else{    $data = array(         "resultCode"=>300,         "message"=>"文件名不能为空!"
         );    echo json_encode($data);
}?>

(The above codes are all corresponding interfaces developed according to the needs of my project)

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