The whole process of developing APP interface with PHP (1)

1. Learning points:

Server side –> Database | Cache –> Call interface –> Client

2. APP Interface introduction: (PHP development APP interface)

PHP object-oriented interface: abstract class, interface definition==>interface.php

===>1. Very Specification

APP interface (communication interface): obtain data through the interface and fill the data into the APP

—>APP developer attention: request APP address (interface address) return data

APP (communication) interface definition:

1. Interface address: http://app.com/api.php?format=xml

2. Interface file: app. PHP handles some business logic

3. Interface data

(Recommended learning: PHP video tutorial)

3. Client APP communication :

How APP communicates:

      C   （接口地址：http://app.com/api.php?format=xml/json）     S
   客户端APP            ------------------------------>             服务器
                      <-----------------------------                                    
                         返回数据

4. Client APP communication format difference

1.xml: extension tag Language (1. Used to mark data and define data types. It is a source language that allows users to define their own markup languages. The XML format is unified, cross-platform and language, very suitable for data transmission and communication, and has long been recognized by the industry. Standard)

<?xml version="1.0" encoding="UTF-8"?>
    <item>
        <title>测试</title>
        <test id="1">
        <description>测试oen</description>
        <address>深圳</address>
    </item>

2.json: A cool-level data exchange format with good readability and easy to write quickly. It can be used for data exchange on different platform certificates. JSON uses high compatibility , completely independent of the language text format. This property makes JSON an ideal data exchange language.

The readability of XML is better, the data generation of JSON (json_encode (array)) and the transmission speed are better

5. What the APP interface does:

Get data: Get data from the database or cache, and then return the data to the client through the interface

Submit data: Submit the data to the server through the interface, and then enter the database for processing through the server, or other processing

6.JSON encapsulation communication interface

PHP generates json data: json_encode($arr);

Note: This function can only accept UTF -8 encoded data, if you pass data in other formats, the function will return null

Communication data annotation format:

code 状态码（200 400等） 
message 提示信息（邮箱格式不正确；数据返回成功等） 
data 返回相应的数据 
—————————- 
-JSON 
code : 200 
message ：”数据返回成功” 
-data 
id ：1 
name : “测试”

Instance:

  某个server中：
    public  function json($code,$message = '',$data = array())
    {
            if (!is_numeric($code)){
                return '错误';
            }
             $result = array(
                'code' => $code,
                'message' => $message,
                'data' => $data
        );
        echo json_encode($result);
        exit;
       }

A certain Controller:

    public function jsonsAction()
           {
               $arr = array(
                   'id' => 1,
                   'name' => 'jiang'
              );
            $k = wei()->zhwCategory()->json(200,'成功咯',$arr);
            return $k;
            }

Browser: http://127.0.0.1/admin/zhw-categorys/jsons

{"code":200,"message":"\u6210\u529f\u54af","data":{"id":1,"name":"jiang"}}

7.PHP generates XML data:

7.1 PHP generates XML data

1. Assemble string

2. Use system class: DomDocument

XMLWriter

SimpleXML

If used DomDocument:

    <?php 
                     $dom = new DomDocument(&#39;1.0&#39;,&#39;utf-8&#39;);
                     $element = $dom->createElement(&#39;test&#39;,&#39;This id root element&#39;);
                     $dom->appendChild($element);
                     echo $dom->saveXML();
              ?>

====>Result:

           <?xml version="1.0" encoding="utf-8"?>
           <test>This is the root element</test>

Simple instantiation using assembled string:

    public static function xml()
            {
                  header("Content-Type:text/html");
                  $xml = "<?xml version=&#39;1.0&#39; encoding=&#39;UTF-8&#39;?>\n";
                  $xml .= "<root>\n";
                  $xml .= "<code>200</code>\n";
                  $xml .= "<message>数据返回成功</message>\n";
                  $xml .= "<data>\n";
                  $xml .="<id>1</id>\n";
                  $xml .="<name>测试</name>\n";
                  $xml .="</data>\n";
                  $xml .="<root>";
                  echo $xml;
             }

  7.2封装XML数据方法：
          封装方法：xmlEncode($code,$message='',$data = array());
         data数据分析：
                 1.array('index' => 'api');
                 2.array(1,7.89);
        具体：
            server模块下：

    public function xmlEncode($code,$message = '',$data=array())
             {
                 if(!is_numeric($code)){
                    return "错误";
                 }
                 $result = array(
                     'code' => $code,
                     'message' => $message,
                     'data' => $data,
                 );
                 header("Content-Type:text/xml");
                 $xml = "<?xml version=&#39;1.0&#39; encoding=&#39;UTF-8&#39;?>\n";
                 $xml .= "<root>\n";
                 $xml .=self::xmlToEncode($result);
                 $xml .="</root>";
                 echo $xml;
             }

        //对数据再处理

    public function xmlToEncode($data){
               $xml = $attr ="";
               foreach ($data as $key=>$value){
               if(is_numeric($key)){
                   $attr = "id='{$key}'";
                   $key = "item";
               }
               $xml .= "<{$key} {$attr}>";  //它们{$key} {$attr}之间要有一个小空格
               $xml .=is_array($value) ? self::xmlToEncode($value):$value;
               $xml .="</{$key}>\n";
            }
               return $xml;
            }

某个Controller:

     public function xmlsAction()
        {
            $arr = array(
               'id' => 1,
               'name' => 'jiang',
               'type' =>array(4,5,6),
               'test' =>array(1,45,67=>array(1,2,3)),
            );
           $k = wei()->zhwCategory()->xmlEncode(200,'成功咯',$arr);
           return $k;
         }

8 .Comprehensive method of encapsulating communication data:

   封装方法：show($code,$message,$data=array(),$type='json/xml')

Final page:

server:

<?php

namespace Miaoxing\Zhw\Service;

use miaoxing\plugin\BaseModel;

class ZhwCategory extends BaseModel
{
    const JSON = "json";
    /**
     * 按x综合方式输出通信数据
     * @param integer $code 状态码
     * @param string $message 提示信息
     * @param array $data 数据
     * @param string $type 数据类型
     * return string
     */
    public function show($code,$message=&#39;&#39;,$data=array(),$type = self::JSON)
    {
        if (!is_numeric($code)){
            return "错误编码";
        }
        $result = array(
            &#39;code&#39; => $code,
            &#39;message&#39; => $message,
            &#39;data&#39; => $data,
        );
        if($type == &#39;json&#39;){
            self::json($code,$message,$data);
            exit;
        }elseif($type == &#39;array&#39;){
            var_dump($result);
        }elseif ($type == &#39;xml&#39;){
            self::xmlEncode($code,$message,$data);
            exit;
        }else{
            //TODO
        }
    }
    /**
     * 按json方式输出通信数据
     * @param integer $code 状态码
     * @param string $message 提示信息
     * @param array $data 数据
     * return string
     */
    public  function json($code,$message = &#39;&#39;,$data = array())
    {
        if (!is_numeric($code)){
            return &#39;错误&#39;;
        }
        $result = array(
            &#39;code&#39; => $code,
            &#39;message&#39; => $message,
            &#39;data&#39; => $data
        );
        echo json_encode($result);
        exit;
    }
    /**
     * 按xml方式输出通信数据
     * @param integer $code 状态码
     * @param string $message 提示信息
     * @param array $data 数据
     * return string
     */
    public function xmlEncode($code,$message = &#39;&#39;,$data=array())
    {
        if(!is_numeric($code)){
            return "错误";
        }
        $result = array(
            &#39;code&#39; => $code,
            &#39;message&#39; => $message,
            &#39;data&#39; => $data,
        );
        header("Content-Type:text/xml");
        $xml = "<?xml version=&#39;1.0&#39; encoding=&#39;UTF-8&#39;?>\n";
        $xml .= "<root>\n";
        $xml .=self::xmlToEncode($result);
        $xml .="</root>";
        echo $xml;
    }
    //对数据再处理
    public function xmlToEncode($data){
        $xml = $attr ="";
        foreach ($data as $key=>$value){
            if(is_numeric($key)){
                $attr = "id=&#39;{$key}&#39;";
                $key = "item";
            }
            $xml .= "<{$key} {$attr}>";
            $xml .=is_array($value) ? self::xmlToEncode($value):$value;
            $xml .="</{$key}>\n";
        }
        return $xml;
    }
}

Controller:
public 
function jsonsAction()
    {
        $arr = array(
            'id' => 1,
            'name' => 'jiang'
        );
        $k = wei()-
>zhwCategory()->json(200,'成功咯',$arr);
        return $k;
    }
    public function xmlsAction()
    {
        $arr = array(
            
'id' => 1,
            'name' => 'jiang',
            'type' =>array(4,5,6),
            'test' =>array(1,45,67=>array(1,2,3)),
        
);
        $k = wei()->zhwCategory()->xmlEncode(200,'成功咯',$arr);
        return $k;
    }
    public function showAction()
    {
        
$arr = array(
            'id' => 1,
            'name' => 'jiang',
            'type' =>array(4,5,6),
            'test' =>array
(1,45,67=>array(1,2,3)),
        );
        $k = wei()->zhwCategory()->show(200,'成功咯',$arr,'json');
        return $k;
    }

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