form field validation (numeric or empty only)

[Veronika7747]

What is the proper code to have input field left blank or numeric only?? I know this is an elementary for most of you, but I am just getting my feet wet...

  if (!is_numeric($a_item1))
	 {
    $error = true;
      $messageStack->add('silent', 'Leave empty, or enter only numbers in the input box!');
}

Thank you.

[DrByte]

you can check if $a_item1 is blank by $a_item1 == ''

[Veronika7747]

you can check if $a_item1 is blank by $a_item1 == ''

Yes I did that

if( ($a_item1 !='') && (!is_numeric($a_item1)) ){
    $error = true;
    $messageStack->add('silent', 'Leave empty, or enter only numbers in your bid input box!');
}

and before I could change && to || something strange started to happen..

A. I am changing only 2 php files while I am testing this. I made a back-up of these files (working even though not correctly, but I get to see the form).
B. Now I start making changes and the page that should show the form is blank.
C. I restore the original files (incorrectly coded, but at least displaying my form) and the screen is still blank!!
How can it be???

Totally confused now..

[DrByte]

and the screen is still blank!!

https://www.zen-cart.com/tutorials/index.php?article=82

[Veronika7747]

https://www.zen-cart.com/tutorials/index.php?article=82

But I keep restoring the 2 original files after I make a mess... and it still does not work as before my mistakes. That's the part I cannot understand..

[yellow1912]

Im writing a validation class for ZC, (already finished but havent posted yet) you can have a look if you want.

https://svn.rubikintegration.com/zen...validation.php
For example, to check if the customers_email_address passed in POST is not empty and is valid email:

$yvalidation = new yvalidation();
$rules = array('customers_email_address' => array(array('validation_is_not_empty'=>''),
                                         array('validation_is_email'=>'')));
$yvalidation->set_params($_POST);
$yvalidation->set_rules($rules);
$error_counter = $yvalidation->run(); // store the number of errors here 

Multiple fields can be checked at once, each field can be checked against multiple rules.