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();