File: vendor/phpcsstandards/phpcsextra/Universal/Docs/CodeAnalysis/NoDoubleNegativeStandard.xml

<?xml version="1.0"?>
<documentation xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:noNamespaceSchemaLocation="https://phpcsstandards.github.io/PHPCSDevTools/phpcsdocs.xsd"
    title="No Double Negative"
    >
    <standard>
    <![CDATA[
    Detects double negation in code, which is effectively the same as a boolean cast, but with a much higher cognitive load.
    ]]>
    </standard>
    <code_comparison>
        <code title="Valid: using singular negation or a boolean cast.">
        <![CDATA[
$var = $a && <em>!</em> $b;

if(<em>(bool)</em> callMe($a)) {}
        ]]>
        </code>
        <code title="Invalid: using double negation (or more).">
        <![CDATA[
$var = $a && <em>! !</em> $b;

if(<em>! ! !</em> callMe($a)) {}
        ]]>
        </code>
    </code_comparison>
</documentation>