/**
* Selects the default value from the choices if NULLs are not allowed, but
* the given value is NULL.
*
* This is intended to mimic the way MySQL selects the default value if
* nothing is given.
*
* @param mixed $value
* @return string
*/
public function set($value)
{
if ($value === NULL and !$this->allow_null) {
// Set value to the default value
$value = $this->default;
}
return parent::set($value);
}
