File: vendor/squizlabs/php_codesniffer/src/Standards/Generic/Docs/WhiteSpace/IncrementDecrementSpacingStandard.xml

<documentation title="Increment Decrement Spacing">
    <standard>
    <![CDATA[
    There should be no whitespace between variables and increment/decrement operators.
    ]]>
    </standard>
    <code_comparison>
        <code title="Valid: No whitespace between variables and increment/decrement operators.">
        <![CDATA[
++<em></em>$i;
--<em></em>$i['key']['id'];
ClassName::$prop<em></em>++;
$obj->prop<em></em>--;
        ]]>
        </code>
        <code title="Invalid: Whitespace between variables and increment/decrement operators.">
        <![CDATA[
++<em> </em>$i;
--<em>   </em>$i['key']['id'];
ClassName::$prop<em>    </em>++;
$obj->prop<em>
</em>--;
        ]]>
        </code>
    </code_comparison>
</documentation>