public function post($key, $type = null) {
		return self::fromSource(\INPUT_POST, $_POST, $key, $type);
	}
public function post($key, $type = null) {
		return self::fromSource(\INPUT_POST, $_POST, $key, $type);
	}
public function post ( $ key , $ type = null ) { return self :: fromSource ( \ INPUT_POST , $ _POST , $ key , $ type ) ; }
Returns a validated, filtered and typecast value from the `POST` variables

@param string $key the name of the element to return from the `POST` variables
@param int|null $type one of the constants from this class starting with `DATA_TYPE_` or `null`
@return mixed|null the validated, filtered and typecast value of the requested data type
Returns a validated filtered and typecast value from the POST variables