PHP development message board page to submit PHP files

Message board page submits php file

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<?php

include ("conn.php");
$id=$_POST['id'];
$user=$_POST['user'];
$title=$_POST['title'];
$content=$_POST['content'];
if ($_POST['submit']){
  $sql="insert into message(id,user,title,content,lastdate)values('','$user','$title','$content',now())";
    mysql_query($sql);
    echo "<script>alert('提交成功！返回首页。');location.href='add.html';</script>";
}
?>

Call Database connection file, when you click submit, use post submission method, use sql language insert into to write the file to the id user title content lasdata in the message table

echo "<script>alert('Submission successful! Return Home page. ');location.href='add.html';</script>";

uses js to prompt and return the pop-up window.

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Difficulty: How to use and obtain

$_POST

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