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