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Losing $_GET variable inside if clause

Posted on 2009-07-08
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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'; ?>

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Question by:AphX
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9 Comments
 
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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'; ?>

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0
 
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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 59

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)
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LVL 59

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.
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LVL 27

Assisted Solution

by:yodercm
yodercm 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().
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Author Closing Comment

by:AphX
ID: 31601123
Thank you!

Now I see!
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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. ;)
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Expert Comment

by:Kevin Cross
ID: 24804560
*Shame NOT same. :)
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Author Comment

by:AphX
ID: 24805484
Thank you! :)
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