浅谈使用 PHP 进行手机 APP 开发（API 接口开发）

<?php
  $output = array();
  $a = @$_GET['a'] ? $_GET['a'] : '';
  $uid = @$_GET['uid'] ? $_GET['uid'] : 0;
  if (empty($a)) {
   $output = array('data'=>NULL, 'info'=>'坑爹啊!', 'code'=>-201);
   exit(json_encode($output));
   }
   
 //走接口
  if ($a == 'get_users') {
   //检查用户
   if ($uid == 0) {
     $output = array('data'=>NULL, 'info'=>'The uid is null!', 'code'=>-401);
      exit(json_encode($output));
   }
   //假设 $mysql 是数据库
  $mysql = array(
   10001 => array(
     'uid'=>10001,
     'vip'=>5,
     'nickname' => 'Shine X',
     'email'=>'979137@qq.com',
     'qq'=>979137,
     'gold'=>1500,
     'powerplay'=> array('2xp'=>12,'gem'=>12,'bingo'=>5,'keys'=>5,'chest'=>8),
     'gems'=> array('red'=>13,'green'=>3,'blue'=>8,'yellow'=>17),
     'ctime'=>1376523234,
     'lastLogin'=>1377123144,
     'level'=>19,
     'exp'=>16758,
      ),
     10002 => array(
      'uid'=>10002,
      'vip'=>50,
      'nickname' => 'elva',
      'email'=>'elva@ezhi.net',
      'qq'=>NULL,
      'gold'=>14320,
      'powerplay'=> array('2xp'=>1,'gem'=>120,'bingo'=>51,'keys'=>5,'chest'=>8),
      'gems'=> array('red'=>13,'green'=>3,'blue'=>8,'yellow'=>17),
      'ctime'=>1376523234,
      'lastLogin'=>1377123144,
      'level'=>112,
      'exp'=>167588,
      ),
     10003 => array(
      'uid' => 10003,
      'vip' => 5,
      'nickname' => 'Lily',
      'email' => 'Lily@ezhi.net',
      'qq' => NULL,
      'gold' => 1541,
      'powerplay'=> array('2xp'=>2,'gem'=>112,'bingo'=>4,'keys'=>7,'chest'=>8),
      'gems' => array('red'=>13,'green'=>3,'blue'=>9,'yellow'=>7),
      'ctime' => 1376523234,
      'lastLogin'=> 1377123144,
      'level' => 10,
      'exp' => 1758,
        ),
       );
       $uidArr = array(10001,10002,10003);
       if (in_array($uid, $uidArr, true)) {
        $output = array('data' => NULL, 'info'=>'The user does not exist!', 'code' => -402);
        exit(json_encode($output));
       }
   
       //查询数据库
       $userInfo = $mysql[$uid];
       //输出数据
       $output = array(
        'data' => array(
        'userInfo' => $userInfo,
        'isLogin' => true,//是否首次登陆
        'unread' => 4,//未读消息数量
        'untask' => 3,//未完成任务
        ), 
      'info' => 'Here is the message which, commonly used in popup window', //消息提示，客户端常会用此作为给弹窗信息。
      'code' => 200, //成功与失败的代码，一般都是正数或者负数
        );
       exit(json_encode($output));
    } elseif ($a == 'get_games_result') {
    
       //... 
       die('您正在调 get_games_result 接口!'); 
      } elseif ($a == 'upload_avatars') { 
       //.... 
       die('您正在调 upload_avatars 接口!');
    
      }