Passing PHP form variables from one page to other - php

Question

my php configuration on server are showing i can post variables to maximum size upto 8MB , thats enough .. but how to check for number of variables , sever is running ubuntu 4.4 , php .
i have a page which takes students marks and send them to a action page , but on action page doing echo for the post variables nothing is being displayed , where are doing an echo "hello"; this shows ...
this is the page which sends the variables
<form name="frm" action="marklistI.php" method="POST" class="" >
<?php $tb->displayTable() ?>
<div class="mainframe">
<input type="hidden" name="batch" value="<?php print $_GET['batch']; ?>"/>
<input type="hidden" name="sem" value="<?php print $_GET['sem']; ?>" />
<input type="hidden" name="chance" value="<?php print $_GET['chance']; ?>"/>
<input name="submit" type="submit" class="hide" value="Save"/>
<input type="hidden" name="url" value="<?php print $_SERVER['REQUEST_URI']; ?>"/>
</div>
</form>
and this are the variables are coming to action page .. but on echo they are not showing any value .
$dept =$_COOKIE['dept'];
$join=$_POST['batch'];
$type='e';
$sem=$_POST['sem'];
$chance=$_POST['chance'];

Answer 1

try placing this code on your action page:
if (isset($_GET)) {
echo "<h3>GET METHOD</h3>";
var_dump($_GET);
}
if (isset($_POST)) {
echo "<h3>POST METHOD</h3>";
var_dump($_POST);
}
if (isset($_COOKIE)) {
echo "<h3>COOKIE METHOD</h3>";
var_dump($_COOKIE);
}
See which method returns your variables and use it, otherwise, you are not filling any values on the form.

Answer 2

this is your code:
<form name="frm" action="marklistI.php" method="POST" class="" >
<?php $tb->displayTable(); ?>
<div class="mainframe"> <input type="hidden" name="batch" value="<?php print $_GET['batch']; ?>"/>
<input type="hidden" name="sem" value="<?php print $_GET['sem']; ?>" />
<input type="hidden" name="chance" value="<?php print $_GET['chance']; ?>"/>
<input name="submit" type="submit" class="hide" value="Save"/>
<input type="hidden" name="url" value="<?php print $_SERVER['REQUEST_URI']; ?>"/>
</div>
</form>
One possible reason for your issue:
You use "_GET[]" variables here but the form is POST.
GET and POST are two different methods to send data, GET is in the URL path (a=&b=&c=) while POST is hidden in the HTML headers.
So make sure you read those results as "$_POST['name']" and not GET.
I suggest this in the "receiving script" for debugging:
var_dump($_GET);
var_dump($_POST);
And in your browser use Chrome or Firefox + Firebug and Press "f12".
In that debugger you can catch the POST when you click the button and you can look which variables were sent.
That should help you debug your issue fast.
One other suggestion, I personally would write the code less "mixed".
It makes it hard to read and hard to modify.
Why not like this:
<?php
echo "
<form name='frm' action='marklistI.php' method='POST' class='' >".
$tb->displayTable().
"<div class='mainframe'>
<input type='hidden' name='batch' value='$_GET[batch]'/>
<input type='hidden' name='sem' value='$_GET[sem]' />
<input type='hidden' name='chance' value='$_GET[chance]'/>
<input name='submit' type='submit' class='hide' value='Save'/>
<input type='hidden' name='url' value='$_SERVER[REQUEST_URI]'/>
</div>
</form> ";
?>
My guess for your problem is that those values in the formular are actually empty, that's why you don't receive anything.