File: vendor/squizlabs/php_codesniffer/src/Standards/Generic/Docs/CodeAnalysis/JumbledIncrementerStandard.xml

<documentation title="Jumbled Incrementers">
    <standard>
    <![CDATA[
    Incrementers in nested loops should use different variable names.
    ]]>
    </standard>
    <code_comparison>
        <code title="Valid: Two different variables being used to increment.">
        <![CDATA[
for ($i = 0; $i < 10; <em>$i++</em>) {
    for ($j = 0; $j < 10; <em>$j++</em>) {
    }
}
        ]]>
        </code>
        <code title="Invalid: Inner incrementer is the same variable name as the outer one.">
        <![CDATA[
for ($i = 0; $i < 10; <em>$i++</em>) {
    for ($j = 0; $j < 10; <em>$i++</em>) {
    }
}
        ]]>
        </code>
    </code_comparison>
</documentation>