带有$ _POST函数的未定义索引

Question

So I Basically copied the following code, execpt renaming columns names.

The form is folowing:

<table align="left" width="30%" border="0" >
<form action="company_edit_php.php" method="post">
<tr><td align="center" bgcolor="#ECE6E6">Location: <td align="center"> <input type="text" value="<?php echo $row['Location']?>"/><br></td></tr>
<tr><td align="center" bgcolor="#ECE6E6">User: <td align="center">  <input type="text" value="<?php  echo $row['User']?>"/><br></td></tr>
<tr><td align="center" bgcolor="#ECE6E6">Telephone: <td align="center">  <input type="text" value="<?php echo $row['Telephone']?>"/><br></td></tr>
<tr><td align="center" bgcolor="#ECE6E6">Email: <td align="center">  <input type="text" value="<?php echo $row['Email']?>"/><br></td></tr>
<td> <input type="submit" value="Change" /></td></tr>

And PHP code:

<?php
$con = mysql_connect("localhost","username","password");
$id = isset($_GET['id']) ? (int)$_GET['id']: 1;
mysql_select_db("Database", $con);

if (isset($_POST['Location'])) {
    echo $_POST['Location'];
 } else {
    echo 'empty';
 } 

$Location = $_POST['Location'];

Result of this code is Undefined index: Location and from if statement i get "empty". Why this same code work for another page? What should I do now?

Thank you for your efforts

Answer 1

To correct the index post, use this command at the beginning of the file and uses the variable $Location

$Location = (isset($_POST["Location"])?$_POST["Location"]:"");