File: vendor/squizlabs/php_codesniffer/src/Standards/Squiz/Docs/ControlStructures/LowercaseDeclarationStandard.xml

<documentation title="Lowercase Control Structure Keywords">
    <standard>
    <![CDATA[
    The PHP keywords if, else, elseif, foreach, for, do, switch, while, try, and catch should be lowercase.
    ]]>
    </standard>
    <code_comparison>
        <code title="Valid: Lowercase if keyword.">
        <![CDATA[
<em>if</em> ($foo) {
    $bar = true;
}
        ]]>
        </code>
        <code title="Invalid: Uppercase if keyword.">
        <![CDATA[
<em>IF</em> ($foo) {
    $bar = true;
}
        ]]>
        </code>
    </code_comparison>
</documentation>