PHP答题类应用接口实例

<?php  
session_cache_expire(60);  
session_start();  
if(!isset($_SESSION['zaszh_user_id'])){  
    echo json_encode(array('status'=>'error','msg'=>'连接超时，请重新打开页面。'));  
    exit;  
}  
$user_id = $_SESSION['zaszh_user_id'];  
  
// $user_id = 1; // 测试用  
  
// 随机获取5道问题  
$question_id = array();  
while(sizeof($question_id)<5){  
    $num_rand = mt_rand(1,114);  
    if(!in_array($num_rand, $question_id))  
        $question_id[] = $num_rand;  
}  
  
require('connect_database.php');  
// 答题次数  
$mysqli->query("update zaszh_user set answer_surplus=answer_surplus-1 where id={$user_id} and answer_surplus>0");  
if($mysqli->affected_rows){  
    // 有剩余次数  
}else{  
    // 无剩余次数  
    echo json_encode(array('status'=>'error','msg'=>'今日答题剩余次数已用完，明天再来哦~'));  
    $mysqli->close();  
    exit;  
}  
// 题目  
if($stmt = $mysqli->prepare("select question,A,B,C,D,answer from zaszh_question where id in(?,?,?,?,?)")){  
    $stmt->bind_param('iiiii',$question_id[0],$question_id[1],$question_id[2],$question_id[3],$question_id[4]);  
    $stmt->execute();  
    $stmt->bind_result($question,$A,$B,$C,$D,$answer);  
    $rows = array();  
    while($stmt->fetch()){  
        $rows[] = array(  
            'question'=>$question,  
            'A'=>$A,  
            'B'=>$B,  
            'C'=>$C,  
            'D'=>$D,  
            'answer'=>$answer  
        );  
    }  
    // 答题记录  
    if($stmt = $mysqli->prepare("insert into zaszh_answer(user_id,question1,question2,question3,question4,question5,create_date) values(?,?,?,?,?,?,unix_timestamp(now()))")){  
        $stmt->bind_param('iiiiii',$user_id,$question_id[0],$question_id[1],$question_id[2],$question_id[3],$question_id[4]);  
        $stmt->execute();  
        if($answer_id = $stmt->insert_id){  
            $param = array(  
                'answer_id'=>$answer_id  
            );  
            echo json_encode(array_merge($rows,$param));  
        }else{  
            echo json_encode(array('status'=>'error','msg'=>'系统出错。'));  
        }  
    }  
    $stmt->close();  
}  
$mysqli->close();