PHP Form fields

I have a form on a page and one of the questions on the form is the number of minors you have.  If you enter 0 and click submit you are taken to another page.  The new page has all of the same form fields as the prior page and hee you can edit you entries before a final submit.  The thing is, if you enter "0" on the first form it does not retain that number when you go to the next page.  It will retain 00 however.  Any clues?
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rgranlundAsked:
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Dave BaldwinFixer of ProblemsCommented:
Show us code.  Otherwise we are just guessing.
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rgranlundAuthor Commented:
It is the field for Minors:
http://23.101.151.179/index.php?/store/
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RobOwner (Aidellio)Commented:
the issue will be in your php code, not the front end. Are you dieting the input once it's been posted?
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RobOwner (Aidellio)Commented:
the issue will be in your php code, not the front end. Are you filtering the input once it's been posted?
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Ray PaseurCommented:
Here is the general design pattern showing how to get PHP to remember data from a form.  Basically you just assign the values to variables that are used in the creation of the HTML form.

<?php // demo/form_highlight_errors.php

/**
 * Demonstrate how to highlight errors in form input, and remember valid inputs
 * Client is asked to put in a value
 * If the value fails our test we show an error message
 * We put a marker next to the input control on the form
 * We turn the form border red
 * SEE http://www.w3schools.com/CSS/pr_class_visibility.asp
 */
error_reporting(E_ALL);


// THESE STYLE ELEMENTS ARE SET FOR THE SCRIPT INITIALIZATION
$error_abc = $error_xyz = $error_any = 'hidden';
$boxer_abc = $boxer_xyz              = 'black';


// CAPTURE AND NORMALIZE THE POST VARIABLES - ADD YOUR OWN SANITY CHECKS HERE
$abc = (isset($_POST["abc"])) ? trim(strtoupper($_POST["abc"])) : NULL;
$xyz = (isset($_POST["xyz"])) ? trim(strtoupper($_POST["xyz"])) : NULL;


// IF ANYTHING WAS POSTED, VALIDATE IT
if (!empty($_POST))
{
    // VALIDATE THE 'abc' FIELD
    if ($abc != 'ABC')
    {
        // VALIDATION FAILED
        $error_abc = $error_any = 'visible';
        $boxer_abc = 'red';

        // BECAUSE THIS FAILED VALIDATION, REMOVE IT FROM THE FORM
        $abc       = NULL;
    }

    // VALIDATE THE 'xyz' FIELD
    if ($xyz != 'XYZ')
    {
        // VALIDATION FAILED
        $error_xyz = $error_any = 'visible';
        $boxer_xyz = 'red';

        // BECAUSE THIS FAILED VALIDATION, REMOVE IT FROM THE FORM
        $xyz       = NULL;
    }

    // DO WE HAVE INPUT FREE FROM ANY ERRORS?
    if ($error_any != 'visible')
    {
        echo "CONGRATULATIONS";
        die();
    }

    // OTHERWISE... OOPS - WE HAVE ERRORS AND MUST SHOW THE FORM AGAIN
}

// IF NOTHING WAS POSTED, OR IF THERE ARE ERRORS, WE NEED NEW CLIENT INPUT
$form = <<<ENDFORM
<style type="text/css" media="all">
.error_any { visibility:$error_any; }
.error_abc { visibility:$error_abc; }
.error_xyz { visibility:$error_xyz; }
</style>
<pre>
<form method="post">
<span class="error_any">PLEASE CORRECT THE FOLLOWING ERRORS</span>
<span class="error_abc">YOU MUST ENTER 'abc' IN THIS FIELD</span>
PLEASE ENTER "ABC" HERE: <input style="border-color:$boxer_abc;" name="abc" value="$abc" />
<span class="error_xyz">YOU MUST ENTER 'xyz' IN THIS FIELD</span>
PLEASE ENTER "XYZ" HERE: <input style="border-color:$boxer_xyz;" name="xyz" value="$xyz" />
<input type="submit" />
</form>
ENDFORM;

// WRITE THE FORM WITH THE APPROPRIATE CSS STYLES ON THE ERROR MESSAGE FIELDS
echo $form;

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Mark BradyPrincipal Data EngineerCommented:
It will also depend on how you are sending the form data to the other page. For example if if is a GET request then the php will see the 0 or '0' and turn it into a boolean false. If you posted the code we could better diagnose your issue.
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