File: vendor/phpcsstandards/phpcsextra/Universal/Docs/Arrays/DuplicateArrayKeyStandard.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="Duplicate Array Key"
    >
    <standard>
    <![CDATA[
        When a second array item with the same key is declared, it will overwrite the first.
        This sniff detects when this is happening in array declarations.
    ]]>
    </standard>
    <code_comparison>
        <code title="Valid: Arrays with unique keys.">
        <![CDATA[
$args = array(
    <em>'foo'</em> => 22,
    <em>'bar'</em> => 25,
    <em>'baz'</em> => 28,
);

$args = array(
    22,
    25,
    2 => 28,
);
        ]]>
        </code>
        <code title="Invalid: Array with duplicate keys.">
        <![CDATA[
$args = array(
    <em>'foo'</em> => 22,
    <em>'bar'</em> => 25,
    <em>'bar'</em> => 28,
);

$args = array(
    22,
    25,
    1 => 28,
);
        ]]>
        </code>
    </code_comparison>
</documentation>