php项目中的接口怎么写

<?php
// 设置json格式
header(&#39;content-type:application/json;charset=utf-8&#39;);
$output = array();
$a = @$_GET[&#39;a&#39;] ? $_GET[&#39;a&#39;] : &#39;&#39;;
$uid = @$_GET[&#39;uid&#39;] ? $_GET[&#39;uid&#39;] : 0;
if (empty($a)) {
    $output = array(&#39;data&#39;=>NULL, &#39;info&#39;=>&#39;数据错误&#39;, &#39;code&#39;=>-201);
    exit(json_encode($output));
}
//走接口
if ($a == &#39;get_users&#39;) {
    //检查用户
    if ($uid == 0) {
        $output = array(&#39;data&#39;=>NULL, &#39;info&#39;=>&#39;The uid is null!&#39;, &#39;code&#39;=>-401);
        exit(json_encode($output));
    }
    //假设 $mysql 是数据库
    $mysql = array(
        10001 => array(
            &#39;uid&#39;=>10001,
            &#39;vip&#39;=>5,
            &#39;nickname&#39; => &#39;Shine X&#39;,
            &#39;email&#39;=>&#39;979137@qq.com&#39;,
            &#39;qq&#39;=>979137,
            &#39;gold&#39;=>1500,
            &#39;powerplay&#39;=> array(&#39;2xp&#39;=>12,&#39;gem&#39;=>12,&#39;bingo&#39;=>5,&#39;keys&#39;=>5,&#39;chest&#39;=>8),
            &#39;gems&#39;=> array(&#39;red&#39;=>13,&#39;green&#39;=>3,&#39;blue&#39;=>8,&#39;yellow&#39;=>17),
            &#39;ctime&#39;=>1376523234,
            &#39;lastLogin&#39;=>1377123144,
            &#39;level&#39;=>19,
            &#39;exp&#39;=>16758,
        ),
        10002 => array(
            &#39;uid&#39;=>10002,
            &#39;vip&#39;=>50,
            &#39;nickname&#39; => &#39;elva&#39;,
            &#39;email&#39;=>&#39;elva@ezhi.net&#39;,
            &#39;qq&#39;=>NULL,
            &#39;gold&#39;=>14320,
            &#39;powerplay&#39;=> array(&#39;2xp&#39;=>1,&#39;gem&#39;=>120,&#39;bingo&#39;=>51,&#39;keys&#39;=>5,&#39;chest&#39;=>8),
            &#39;gems&#39;=> array(&#39;red&#39;=>13,&#39;green&#39;=>3,&#39;blue&#39;=>8,&#39;yellow&#39;=>17),
            &#39;ctime&#39;=>1376523234,
            &#39;lastLogin&#39;=>1377123144,
            &#39;level&#39;=>112,
            &#39;exp&#39;=>167588,
        )
    );
    
    $uidArr = array(10001,10002);
    if (in_array($uid, $uidArr, true)) {
        $output = array(&#39;data&#39; => NULL, &#39;info&#39;=>&#39;The user does not exist!&#39;, &#39;code&#39; => -402);
        exit(json_encode($output));
    }
    //查询数据库
    $userInfo = $mysql[$uid];
    
    //输出数据
    $output = array(
        &#39;data&#39; => array(
            &#39;userInfo&#39; => $userInfo,
            &#39;isLogin&#39; => true,//是否首次登陆
            &#39;unread&#39; => 4,//未读消息数量
            &#39;untask&#39; => 3,//未完成任务
        ), 
        &#39;info&#39; => &#39;Here is the message which, commonly used in popup window&#39;, //消息提示，客户端常会用此作为给弹窗信息。
        &#39;code&#39; => 200, //成功与失败的代码，一般都是正数或者负数
    );
    exit(json_encode($output));
} elseif ($a == &#39;get_games_result&#39;) {
    //...
    die(&#39;您正在调 get_games_result 接口!&#39;);
} elseif ($a == &#39;upload_avatars&#39;) {
    //....
    die(&#39;您正在调 upload_avatars 接口!&#39;);
}

http://localhost/api/test/index.php
http://localhost/api/test/index.php?a=get_users
http://localhost/api/test/index.php?a=get_users&uid=10001
http://localhost/api/test/index.php?a=get_users&uid=10002
http://localhost/api/test/index.php?a=get_users&uid=10003