public function setExpression(string $expr) {
		$this->expression = $expr;
		$this->hasExpression = true;

		return $this;
	}
public function setExpression(string $expr) {
		$this->expression = $expr;
		$this->hasExpression = true;

		return $this;
	}
public function setExpression ( string $ expr ) { $ this -> expression = $ expr ; $ this -> hasExpression = true ; return $ this ; }
Sets an expression

@param string $expr
@return $this
Sets an expression