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为何我的数据不能写入数据库

数据库表的结构

phpMyAdmin SQL Dump

-- version 4.6.4

-- https://www.phpmyadmin.net/

--

-- Host: 127.0.0.1

-- Generation Time: 2017-03-11 06:17:36

-- 服务器版本： 5.7.14

-- PHP Version: 5.6.25

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";

SET time_zone = "+00:00";

--

-- Database: `yisu`

--

-- --------------------------------------------------------

--

-- 表的结构 `yonghu`

--

CREATE TABLE `yonghu` (

`id` int(5) NOT NULL COMMENT '//用户id',

`user` varchar(20) NOT NULL COMMENT '//用户名',

`pass` varchar(20) NOT NULL COMMENT '//用户密码',

`email` varchar(100) NOT NULL COMMENT '//电子邮箱',

`QQ` varchar(11) NOT NULL COMMENT '//用户QQ',

`mtime` datetime NOT NULL COMMENT '//用户注册时间',

`birthday` datetime NOT NULL COMMENT '//生日',

`sex` char(2) NOT NULL COMMENT '//用户性别'

) ENGINE=MyISAM DEFAULT CHARSET=utf8;

php代码为

session_start();

if(isset($_POST["dosubmit"])){

if(strtolower($_SESSION["code"])==strtolower($_POST["code"])){

//链接数据库

define('_DNS_','mysql:host=localhost;dbname=yisu');

define('_NAME_','root');

define('_PASSWORD_','yisu1234');

$pdo=new PDO(_DNS_,_NAME_,_PASSWORD_) or die('数据库链接失败！');

$pdo->exec("SET NAMES 'utf8'");

$_content=array();

$_content['user']=$_POST['user'];

$_content['pass']=md5($_POST['pass']);

$_content['email']=$_POST['email'];

$_content['qq']=$_POST['qq'];

$_content['time']=date('Y-m-d H:i:s');

$_content['chusheng']=$_POST['chusheng'];

$_content['sex']=$_POST['sex'];

$a = $pdo->prepare("INSERT INTO yonghu (user, pass, email, QQ,mtime,birthday,sex)VALUES (?,?,?,?,?,?,?)");

$a->execute(array($_content['user'],$_content['pass'],$_content['email'],$_content['qq'],$_content['time'],$_content['chusheng'],$_content['sex']));

echo "";

}else{

echo '';

}

}

?>