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5 aurelien 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 lowercase.
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    ]]>
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	</standard>
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	<code_comparison>
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		<code title="Valid: lowercase constants">
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        <![CDATA[
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if ($var === <em>false</em> || $var === <em>null</em>) {
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    $var = <em>true</em>;
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}
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        ]]>
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		</code>
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		<code title="Invalid: uppercase constants">
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        <![CDATA[
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if ($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_comparison>
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</documentation>