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])); } } }