public function setAllowedExtensions($value)
{
if ($value === NULL) {
//any file type will be allowed
} else {
$this->_allowedExtentions = JsonFormBuilder::forceArray($value);
for ($i = 0; $i < count($this->_allowedExtentions); $i++) {
$this->_allowedExtentions[$i] = trim(strtolower($this->_allowedExtentions[$i]));
}
}
}
