Be compatible with PER 2.x

[roslov]

https://www.php-fig.org/per/coding-style/

[roslov]

Use a single line for methods with empty bodies. For example:

public method demo() {}

Check this:

<rule ref="Generic.Functions.OpeningFunctionBraceKernighanRitchie">
    <properties>
        <!-- Allow empty function bodies to be formatted on a single line -->
        <property name="allowEmpty" value="true"/>
    </properties>
</rule>