Using ISSET function in PHP

[feqrh]

I have the following code to ensure that the form does not have any unfilled textboxes and selected boxes\[code\]$required_fields = array ('menu_name','visible','position');foreach($required_fields as $fieldname){ if (!isset($_POST[$fieldname]) || empty($_POST[$fieldname]) ) { $errors [] = $fieldname; }}\[/code\]Where menu_name, visible and position are variables that are received through the post methodAm having a problem when the value of 'visible' is zero (0) as it creates an entry into the error array. How can I avoid this as I presume when the value is 0 then it is considered not set by the isset function.