我的代码有什么问题？ [关闭]

Question

Please tell me my error.

The errors are:

Notice: Undefined variable: name in C:\wamp\www\3arabschool\admin\section_insert.php on line 10

Source code is here:

<?php
include("../config/config.php");


if(isset($_POST['name'])){ $name = addslashes($_POST['name']); }
if(isset($_POST['order_sec'])){ $order_sec = addslashes($_POST['order_sec']); }
if(isset($_POST['sub'])){ $sub = $_POST['sub']; }


if ($name == ""){   // this is line 10
echo "<div align='center'>please enter name<ahref='javascript:history.back(1)'>back</a></div>";
}else{
$query = @mysqli_query ($con,"INSERT INTO article_sec (name,sub,order_sec)VALUES ('$name','$sub','$order_sec')") or die ("error query");
echo "<p align='center'>done</p>";
echo "<META HTTP-EQUIV='refresh' CONTENT='1' URL='section.php'>";
}
?>

Answer 1

You are accessing a variable that isn't defined unless $_POST['name'] has been defined.

Change the line

if ($name == ""){

to

if (empty($name)) {

PHP will check to see if the variable is set before trying to access it and see if it's empty using this function. See this doc for more info