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1 lars 1 
<documentation title="PHP Constants">
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    <standard>
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    <![CDATA[
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    The <em>true</em>, <em>false</em> and <em>null</em> constants must always be uppercase.
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    ]]>
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    </standard>
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    <code_comparison>
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        <code title="Valid: uppercase constants">
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        <![CDATA[
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if ($var === <em>FALSE</em> || $var === <em>NULL</em>) {
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    $var = <em>TRUE</em>;
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}
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        ]]>
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        </code>
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        <code title="Invalid: lowercase constants">
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        <![CDATA[
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if ($var === <em>false</em> || $var === <em>null</em>) {
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    $var = <em>true</em>;
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}
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        ]]>
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        </code>
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    </code_comparison>
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</documentation>