/** * Creates an instance of binary expression node, representing the construction: subject IS TRUE * * @param mixed $subject logical subject * * SQL example: * @code * // "hasSmth" IS TRUE * Expression::isTrue("hasSmth"); * @endcode * @return UnaryPostfixExpression */ static function isTrue($subject) { return new UnaryPostfixExpression($subject, UnaryPostfixLogicalOperator::isTrue()); }