public static function expr() : ExpressionBuilder
    {
        if (self::$expressionBuilder === null) {
            self::$expressionBuilder = new ExpressionBuilder();
        }

        return self::$expressionBuilder;
    }
public static function expr() : ExpressionBuilder
    {
        if (self::$expressionBuilder === null) {
            self::$expressionBuilder = new ExpressionBuilder();
        }

        return self::$expressionBuilder;
    }
public static function expr ( ) : ExpressionBuilder { if ( self :: $ expressionBuilder === null ) { self :: $ expressionBuilder = new ExpressionBuilder ( ) ; } return self :: $ expressionBuilder ; }
Returns the expression builder.
Returns the expression builder .