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php hidden variables problem

Discussion in 'PHP' started by vijaykoul, Aug 9, 2005.

  1. #1
    I have a problem making PHP work to its full. i have installed php 5.x version, apache 1.3.x ver and mysql 3.x version

    all of them are working fine. i have a problem....
    when i pass any hidden variable within a form like in the code below

    <?
    if ($chk == "yes")
    {
    echo "hi";
    }
    ?>
    <form>
    <input type="hidden" name="chk" value="yes">
    <input type="submit" value="submit">
    </form>

    now, when i press this submit button, instead of getting "hi" as the output, i get an error which reads as

    undefined variable "chk"
    SEMrush
    i tried to solve this problem many a times, but cant. i even reinstalled php...but that did not solve the purpose....

    i think there must be some problem in the php.ini file

    can anybody help me... please..
    thanks in advance....

    vijay koul
     
    vijaykoul, Aug 9, 2005 IP
    SEMrush
  2. anton-io!

    anton-io! Active Member

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    #2
    seems to me you have to set the $chk variable first ...

    if you're using a form submit, to retrieve the variable, you would need to use:

    // sets the variable
    $chk = $_POST['chk'];

    if ($chk == "yes")
    {
    echo "hi";
    }


    if you are passing the variable in a URL (eg: something.php?chk=yes), then you would use:

    $chk = $_GET['chk'];

    simple examples:

    http://www.tizag.com/phpT/examples/formvar.php
    http://www.w3schools.com/php/php_forms.asp

    Hope that help!

    :D
     
    anton-io!, Aug 9, 2005 IP
  3. Weirfire

    Weirfire Language Translation Company

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    #3
    Would it not be good practise as well to set the form parameters such as

    <form action=$PHP_SELF method=POST>

    I think it's $_GET as well if you dont state method=POST.
     
    Weirfire, Aug 10, 2005 IP
  4. rvarcher

    rvarcher Peon

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    #4
    You can change your level of error reporting using a line like this at the beginning of your file.

    This won't report notices, like undefined variables:
    
    error_reporting(E_ERROR | E_WARNING | E_PARSE);
    
    PHP:
    This reports everything, which seems to be your default setting.
    
    error_reporting(E_ALL);
    
    PHP:
    PHP error info here:
    http://us2.php.net/error_reporting


    The $_REQUEST[] Global variable contains GET and POST data. You could use that to reference your chk, $_REQUEST['chk']. Referencing $chk directly works but not a best practice.

    PHP global variable info here:
    http://us3.php.net/variables.predefined
     
    rvarcher, Aug 10, 2005 IP