Solved

Losing $_GET variable inside if clause

Posted on 2009-07-08
9
258 Views
Last Modified: 2013-12-13
Hi Experts!

the variable $_GET['subtask'] is not being posted to the database.

If I remove "isset($_POST['task'] from the if statement, it will work. But it has to be there.

Note that the other variables are being posted correctly to the database in both cases.

Thank you!
<? include 'inc/func.php'; ?>
<? include 'inc/dbc.php'; ?>
 
<? include 'inc/head.php'; ?>
 
<?
if(isset($_GET['subtask']) && isset($_POST['task'])){
	$q = "INSERT INTO tasks (task, parent_id, added) VALUES ('{$_POST['task']}', '{$_GET['subtask']}', NOW())";
	$r = mysql_query($q);
	redirect("index.php");    
}
?>
 
<? include 'inc/head.php'; ?>
 
<form action="new.php" method="post">
	<label>Task: </label><input name="task" id="task" type="text" />
    <br />
    <br />
    <input name="submit" id="submit" type="submit" value="Submit" />
</form>
 
<? include 'inc/foot.php'; ?>

Open in new window

0
Comment
Question by:AphX
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 3
9 Comments
 
LVL 60

Expert Comment

by:Kevin Cross
ID: 24804028
Try it like this:
(as indicated in the other question, this may need to be $_GET['task'] as well)
<? include 'inc/func.php'; ?>
<? include 'inc/dbc.php'; ?>
 
<? include 'inc/head.php'; ?>
 
<?
if(isset($_GET['subtask']) && isset($_POST['task'])){
        $q = "INSERT INTO tasks (task, parent_id, added) VALUES ('".$_POST['task']."', '".$_GET['subtask']."', NOW())";
        $r = mysql_query($q);
        redirect("index.php");    
}
?>
 
<? include 'inc/head.php'; ?>
 
<form action="new.php" method="post">
        <label>Task: </label><input name="task" id="task" type="text" />
    <br />
    <br />
    <input name="submit" id="submit" type="submit" value="Submit" />
</form>
 
<? include 'inc/foot.php'; ?>

Open in new window

0
 
LVL 2

Author Comment

by:AphX
ID: 24804114
Hi and thanks for fast response!

It didn't work. I can´t even echo $_GET['subtask'] inside the if clause. The exact same echo works outside the if clause.

As I pointed out above: if I use this if statement instead, it works 100%

if(isset($_GET['subtask'])){

Something turns wrong when using $_POST['task'] in the if statement...
0
 
LVL 60

Accepted Solution

by:
Kevin Cross earned 450 total points
ID: 24804121
Oh, yeah and you have to ensure that you are passing on the 'subtask' query parameter, either in the post URL or as another value along side task maybe with a hidden variable.

URL method:
<form action="new.php?<?php echo $_SERVER['QUERY_STRING']; ?>" method="post">

Hidden field method:
<input name="subtask" id="subtask" type="hidden" value="<?php echo $_GET['subtask'] ?>" />
(And then change the if to use $_POST['subtask'] instead)
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 60

Expert Comment

by:Kevin Cross
ID: 24804148
Remember that the $_POST['task'] is only set after the form has been posted; therefore, you have to test that way.  Otherwise, the IF condition will fail as $_POST['task'] will not be set.
0
 
LVL 27

Assisted Solution

by:Cornelia Yoder
Cornelia Yoder earned 50 total points
ID: 24804471
By the way, NEVER use $_GET or $_POST variables directly in a MySQL query!!   It leaves you wide open to SQL Injection hacking!

Always pass the inputs through a safety function such as mysql_real_escape_string().
0
 
LVL 2

Author Closing Comment

by:AphX
ID: 31601123
Thank you!

Now I see!
0
 
LVL 60

Expert Comment

by:Kevin Cross
ID: 24804556
Great point, yodercm.  Same on me for not mentioning as I presented a security discussion on cross-site scripting (XSS) on the very subject.  Definitely a no no, especially going to a database as it becomes the gift that keeps on giving. ;)
0
 
LVL 60

Expert Comment

by:Kevin Cross
ID: 24804560
*Shame NOT same. :)
0
 
LVL 2

Author Comment

by:AphX
ID: 24805484
Thank you! :)
0

Featured Post

[Webinar] Code, Load, and Grow

Managing multiple websites, servers, applications, and security on a daily basis? Join us for a webinar on May 25th to learn how to simplify administration and management of virtual hosts for IT admins, create a secure environment, and deploy code more effectively and frequently.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Deprecated and Headed for the Dustbin By now, you have probably heard that some PHP features, while convenient, can also cause PHP security problems.  This article discusses one of those, called register_globals.  It is a thing you do not want.  …
This article discusses how to implement server side field validation and display customized error messages to the client.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
The viewer will learn how to create a basic form using some HTML5 and PHP for later processing. Set up your basic HTML file. Open your form tag and set the method and action attributes.: (CODE) Set up your first few inputs one for the name and …

732 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question