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Get A Variable

Posted on 2009-06-29
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Last Modified: 2013-11-05
Why can't I get this to work?  
This is a database of veteran's information.  In one table we store all the wars that veterans might have been involved in.  We then build a form that provides a drop down to select a war.  That works fine.  The problem is that when they click SUBMIT, I am not getting the name of the war in the next script.  Any ideas?  Here's the code:


<td width="50%">&nbsp;By Battle/Campaign</td>

	          <td width="50%">&nbsp;By Last Name</td>

		    </tr>

	        <tr></td>

			   <form name="srchid" method="POST" action="admin_veteran_2.php" onsubmit="return submitform('srchid2', 0);">

		      

<td width="15%" class="tdinput">

                  <select size="1" name="srchid2">

				   <?

				   //Display Generations from table

				   foreach($schools as $school){

				   ?>

                    <option value="<? echo $school->ID; ?>"><? echo $school->War; ?></option>

				   <?

				   };

				   ?>

                  </select>

                  <input type="submit" value="srchid2" name="submit" class="frmbut">

                  <input type="hidden" name="action" value="srchid">

	          </td>

			  </form>

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Question by:dougp23
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Expert Comment

by:Roger Baklund
Comment Utility
The code you posted seems ok, maybe the error is in admin_veteran_2.php. How do you fetch the submitted variable?
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by:dougp23
Comment Utility
In admin_veteran_2.php, I have this:
(The first chunk is the function get_param and then the next line is where I try to grab the paramter).  I guess my issue is, I'm not sure WHERE I am storing the parameter from the SELECT.

If I echo $whatis I get nothing.
function get_param($param_name)

{

  global $HTTP_POST_VARS;

  global $HTTP_GET_VARS;
 

  $param_value = "";

  if(isset($HTTP_POST_VARS[$param_name])) {

    $param_value = $HTTP_POST_VARS[$param_name];

  } else if(isset($HTTP_GET_VARS[$param_name])) {

    $param_value = $HTTP_GET_VARS[$param_name];

  }

  return $param_value;

}
 

$whatis=get_param("$srchid2");

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Accepted Solution

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Roger Baklund earned 250 total points
Comment Utility
First, the call to get_param() should be like this, without the $ character:

$whatis=get_param("srchid2");

Second, $HTTP_POST_VARS and $HTTP_GET_VARS are deprecated, and not supported on all servers. Do like this instead, this will fetch both POST and GET variables:

$whatis=isset($_REQUEST['srchid2'])?$_REQUEST['srchid2']:'';
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Author Closing Comment

by:dougp23
Comment Utility
Well that worked!  I guess I must be on a server where those functions are deprecated.  Now I need to do some real digging since I have quite a few PHP apps where I used that function (get_param).  Hopefully they replaced the other calls with something else after deprecating them.
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Expert Comment

by:Roger Baklund
Comment Utility
>> Hopefully they replaced the other calls with something else after deprecating them.

$HTTP_POST_VARS is replaced by $_POST and $HTTP_GET_VARS is replaced by $_GET, both are "superglobals", which means they are automatically available within functions without using the "global" keyword.

http://php.net/manual/en/reserved.variables.php
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