Php error::Function session_is_registered() and Notice: Use of undefined constant username - assumed 'username'

Question

I'm new in PHP.While doing my 1st project.I got two errors.This my code:

<?
session_start();
if(!session_is_registered(username)){
header("location:logindo.php");
}
?>
<table width="300" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#CCCCCC">
<tr>
<form name="form1" method="post" action="show.php">
<td>
<table width="100%" border="0" cellpadding="3" cellspacing="1" bgcolor="#777777">
<tr>
<td colspan="3"><strong>Enter the Student ID</strong></td>
</tr>
<tr>
<td width="110">Student ID:</td>
<td width="6"></td>
<td width="294"><input name="sb_id" type="text" id="sb_id"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td><input type="submit" name="Submit" value="Show"></td>
</tr>
</table>
</td>
</form>
</tr>
</table>

When i go this page it show two error:

Notice: Use of undefined constant username - assumed 'username' in D:\xampp\htdocs\vss\showinfo.php on line 3

Deprecated: Function session_is_registered() is deprecated in D:\xampp\htdocs\vss\showinfo.php on line 3

Why this is showing and how can remove this.

Thanks in advance.

It's very simple there is no function session_is_registered because it's depricated — Alex Rashkov, Jul 17 '11 at 11:05
See also [my attempt at a canonical answer for causes of this error message](http://stackoverflow.com/questions/2941169/what-does-the-php-error-message-notice-use-of-undefined-constant-mean/8025500#8025500). — John Carter, Nov 06 '11 at 06:51

score 1 · Answer 1 · edited Nov 10 '11 at 22:05

1

Replace Line 3 with:

if(!isset($_SESSION['username'])){

edited Nov 10 '11 at 22:05

stevenmirabito

103
3

answered Jul 17 '11 at 11:03

Lawrence Cherone

46,049
7
62
106

It was just missing a closing bracket :) – Paul Dixon Jul 17 '11 at 11:51

Php error::Function session_is_registered() and Notice: Use of undefined constant username - assumed 'username'

1 Answers1