为什么我的phpstorm显示插入数据库失败

我用的是PHP storm，phpstudy的环境，数据库是用的 phpMyAdmin

php
<?php

header("Content-Type:text/html;charset=utf-8");
$username = $_POST['username'];
$pw = $_POST['pw'];
$cpw = $_POST['cpw'];
$sex = $_POST['sex'];
$email =$_POST['email'];
$fav = @implode(",",$_POST['fav']);

//连接数据库
$conn = mysqli_connect("localhost","root","20031022","member");

mysqli_query($conn,"set names utf8");
//sql语句
$sql = "insert into info(username,pw,sex,email,fav,creatime) values('$username','".md5($pw)."','$sex','$email','$fav','".time()."')";
$result = mysqli_query($conn,$sql);
if($result){
    echo"<script>alert('数据插入成功')</script>";
}else{
    echo "<script>alert('数据插入失败')</script>";
}
?>

$sql = "insert into info(username,pw,sex,email,fav,creatime) values('".$username."','".md5($pw)."','".$sex."','".$email."','".$fav."','".time()."')";

把报错信息打印出来看看...