php news release system post request receiving code 02

code show as below;

<?php
 /**
 * Created by PhpStorm.
 * User: Administrator
 * Date: 2017/3/18
 * Time: 18:16
 * This file is used to receive the file passed from new.html
 * Save the data to the database Medium
 */
 //ini_set('date.timezone','Asia/Shanghai');
 date_default_timezone_set( 'PRC' );
 header( "content-type:text/html;charset=utf8" );
 echo "new_post page<br />" ;
 $servername = "localhost" ;
 $username = "root" ;
 $password = "root" ;
$title = $_POST['title'
];
 $content = $_POST [ 'content' ];
 $time = date( "ymd H:i:s" );
 echo $title . "==" . $content . "tite=" . $time ;
 // Set database connection
 $conn = mysqli_connect( $servername , $username , $password );
 mysqli_set_charset( $conn , 'utf8' );
 if ( $conn ) {
 //Database connection is successful
     //Create database
 $sql =
        "create database if not exists mynews";
if (mysqli_query($conn,$sql)) {
//创建数据库成功
        //创建表
$createTableSql="create table if NOT EXISTS mynews.mynews(_id INTEGER PRIMARY KEY  auto_increment,title VARCHAR(30) NOT NULL ,content text  NOT NULL ,cre_time datetime NOT NULL )";
echo $createTableSql;
echo '<br/>';
$create=mysqli_query($conn,$createTableSql);
if ($create){
//插入语句
$insertSql =                                                                             "insert into mynews.mynews(title,content,cre_time) VALUES ('" . $title . "','".$content."','".$time."')";
            //执行插入操作
            echo $insertSql;

            $que = mysqli_query($conn, $insertSql);
            if ($que) {
                //echo "<script>alert('发布成功，返回新闻列表页');location.href='new_list.php';</script>";
                echo "<script>alert('发布成功，返回新闻列表页');location.href='new_list.php';</script>";

            } else {
                //插入失败
                "<script>alert('删除失败');location='" . $_SERVER['HTTP_REFERER'] . "'</script>";
                exit;
            }
        }else{
            echo "数据库表创建失败";
        }


    } else {

        //创建数据库失败
        echo "database error";
    }

} else {

    //数据库连接失败
    echo "数据库连接失败";
}

//The news release successfully uses a die to terminate the display effect as follows: