第一部分,通信接口的实现
标签(空格分隔): PHP 手机后台 api 通信接口 Andy
PHP是世界上最强大的语言。
PHP开发手机API时,一般返回XML或JSON数据类型的数据,除了要返回从源数据(程序本身需要的数据)外还应附上状态码,以下是一段封装后的数据,它使用JSON格式展现:
{
code: 200,
message: "Success",
data: [
{
username: "安明哲",
password: "123456",
level: "1",
gold: "0",
id: "6",
create_time: "2015-09-26 08:25:31",
is_active: "1",
is_admin: "0"
},
{
username: "张三",
password: "12345",
level: "1",
gold: "0",
id: "8",
create_time: "0000-00-00 00:00:00",
is_active: "1",
is_admin: "0"
}
]
}
以下是XML格式数据的实例:
<root>
<code>200</code>
<message>Success</message>
<data>
<item id="0">
<username>安明哲</username>
<password>123456</password>
<level>1</level>
<gold>0</gold>
<id>6</id>
<create_time>2015-09-26 08:25:31</create_time>
<is_active>1</is_active>
<is_admin>0</is_admin>
</item>
<item id="1">
<username>张三</username>
<password>12345</password>
<level>1</level>
<gold>0</gold>
<id>8</id>
<create_time>0000-00-00 00:00:00</create_time>
<is_active>1</is_active>
<is_admin>0</is_admin>
</item>
</data>
</root>
此外,为了方便手机端开发人员的调试,还可直接返回带数据类型的数据:
array(3) {
["code"]=>
int(200)
["message"]=>
string(7) "Success"
["data"]=>
array(2) {
[0]=>
array(8) {
["username"]=>
string(9) "安明哲"
["password"]=>
string(6) "123456"
["level"]=>
string(1) "1"
["gold"]=>
string(1) "0"
["id"]=>
string(1) "6"
["create_time"]=>
string(19) "2015-09-26 08:25:31"
["is_active"]=>
string(1) "1"
["is_admin"]=>
string(1) "0"
}
[1]=>
array(8) {
["username"]=>
string(6) "张三"
["password"]=>
string(5) "12345"
["level"]=>
string(1) "1"
["gold"]=>
string(1) "0"
["id"]=>
string(1) "8"
["create_time"]=>
string(19) "0000-00-00 00:00:00"
["is_active"]=>
string(1) "1"
["is_admin"]=>
string(1) "0"
}
}
}
如何实现
当手机客户端通过API获取数据时,PHP脚本会Response
一个数组,并对这个数组进行encode
,他们分别是json
,xml
和array
;该数组,定义如下:
$result = [
"code" => 200,
"message" => "数据返回成功",
"data" => ["key"=>"value", "key"=>"value"]
]
其中,code
代表状态码,message
代表状态信息,data
是程序逻辑中需要的数据。
如何去设计
当手机端调用API,程序业务逻辑处理完成之后,需要返回数据,此时需要对通信数据进行封装,封装的三种类型由可由REQUEST
里的format
参数指定,当formart=json
时执行response_json
方法,同理,还有response_xml
和response_array
方法;
为了方便调用,编写一个Response
类来封装数据并完成response
工作:
/*本段代码没有经过实际环境测试,也没有严谨的参数检查*/
class Response{
public static function response_api($code, $message='', $data=array()){
//根据formart返回适当的数据
$type = isset($_REQUEST['format'])?$_REQUEST['format']:'';
switch ($type) {
case 'json':
self::response_json($code, $message, $data);
break;
case 'xml':
self::response_xml($code, $message, $data);
break;
case 'array':
echo var_dump(self::grant_array($code, $message, $data));
break;
default:
self::response_json($code, $message, $data);
break;
}
}
public static function response_json($code, $message='', $data=array()){
//返回JSON数据
$result = self::gramt_array($code,$message,$data);
echo json_encode($result);
exit();
}
public static function response_xml($code, $message='', $data=array()){
//返回XML数据
$result = self::gramt_array($code,$message,$data);
$xml = "<?xml version='1.0' encoding='UTF-8'?>";
$xml .= "<root>";
$xml .= self::xml_encode($result);
$xml .= "</root>"
echo $xml;
exit();
}
private function xml_encode($arr=array()){
//对于XML,需要自己实现一个XML的encode方法
$xml = $attr = '';
foreach($arr as $key=>$value){
if(is_numberic($key)){
$key = 'item';
$attr = " id='{$key}'";
}
$xml .= "<{$key}{$attr}>";
$xml .= (is_array($value))?self::xml_encode($value):$value;
$xml .= "</{$key}>";
}
return $xml;
}
private function grant_array($code, $message='', $data=array()){
//在所有操作之前,需要生成符合API规范的数组
$result = {
"code" => $code,
"message" => $message,
"data" => $data
};
return $result;
}
}
Response类实现了通信接口的数据封装,可根据response
内指定的format灵活的写入不同格式的数据到Response。
付:完整代码及调用实例:
<?php
class Response{
/*
* 封通信接口数据
* @param integer $code 状态码
* @param string $message 状态信息
* @param array $data 数据
* return string
*/
public static function api_response($code, $message='',
$data=array()){
$type = isset($_REQUEST['format'])?$_REQUEST['format']:'';
switch ($type) {
case 'json':
self::response_json($code, $message, $data);
break;
case 'xml':
self::response_xml($code, $message, $data);
break;
case 'array':
echo var_dump(self::grant_array($code, $message, $data));
break;
default:
self::response_json($code, $message, $data);
break;
}
}
/*
* 封装数为为json数据类型
* @param integer $code 状态码
* @param string $message 状态信息
* @param array $data 数据
* return string
*/
public static function json_response($code,
$message='', $data=array()){
$result = self::grant_array($code, $message, $data);
echo json_encode($result);
exit;
}
/*
* 封装数为为xml数据类型
* @param integer $code 状态码
* @param string $message 状态信息
* @param array $data 数据
* return string
*/
public static function xml_response($code,
$message='', $data=array()){
$result = self::grant_array($code, $message, $data);
header("Content-Type:text/xml");
$xml = "<?xml version='1.0' encoding='UTF-8'?>\n";
$xml .= "<root>\n";
$xml .= self::xml_encode($result);
$xml .= "</root>";
echo $xml;
exit();
}
/*
* 将数组转换为XML格式
* @param array $array 数组
* return string
*/
private function xml_encode($array=array()){
$xml = $attr = "";
if(!empty($array)){
foreach ($array as $key => $value) {
if(is_numeric($key)){
$attr = " id='{$key}'";
$key = "item";
}
$xml .= "<{$key}{$attr}>" ;
$xml .= is_array($value) ? self::xml_encode($value) : $value;
$xml .="</{$key}>\n";
}
}
return $xml;
}
/*
* 按照接口格式生成原数据数组
* @param integer $code 状态码
* @param string $message 状态信息
* @param array $data 数据
* return array
*/
private function grant_array($code, $message='', $data=array()){
if(!is_numeric($code)){
return '';
}
$result = array(
'code' => $code,
'message' => $message,
'data' => $data
);
return $result;
}
}
调用实例:
<?php
require_once "./DataBaseUtil.class.php";
require_once "./Response.class.php";
$connect = DataBaseUtil::getInstance()->connect();
/*
* 首页接口
* http://domain/hotgirl/callback.php?format=xml/json
*/
$page = isset($_REQUEST['page'])?$_REQUEST['page']:1;
$page_number = isset($_REQUEST['page_number'])?$_REQUEST['page_number']:2;
$lim_start = ($page-1) * $page_number;
$sql = "SELECT * FROM user WHERE is_active=1 LIMIT ".$lim_start.",".$page_number;
$result = mysql_query($sql, $connect);
if($result && mysql_num_rows($result)>0) {
while ($row = mysql_fetch_assoc($result)) {
$rows[] = $row;
}
}
if(!empty($rows)){
return Response::api_response(200, 'Success', $rows);
}
else{
return Response::api_response(403, 'No result from database');
}