reference/misc/functions/constant.xml
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</simpara>
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<simpara>
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This function works also with <link
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linkend="language.oop5.constants">class constants</link>.
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linkend="language.oop5.constants">class constants</link> and <link
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linkend="language.types.enumerations">enum cases</link>.
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</simpara>
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</refsect1>
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<refsect1 role="errors">
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&reftitle.errors;
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<para>
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An <classname>Error</classname> exception is thrown,
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if the constant is not defined. Prior to PHP 8.0.0,
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an <constant>E_WARNING</constant> level error was generated in that case.
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If the constant is not defined, an <classname>Error</classname> exception is thrown.
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Prior to PHP 8.0.0, an <constant>E_WARNING</constant> level error was generated in that case.
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</para>
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</refsect1>
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&reftitle.examples;
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<para>
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<example>
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<title><function>constant</function> example</title>
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<title>Using <function>constant</function> with Constants</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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]]>
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</programlisting>
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</example>
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<example>
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<title>Using <function>constant</function> with Enum Cases (as of PHP 8.1.0)</title>
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<programlisting role="php">
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<![CDATA[
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<?php
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enum Suit
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{
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case Hearts;
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case Diamonds;
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case Clubs;
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case Spades;
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}
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$case = 'Hearts';
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var_dump(constant('Suit::'. $case)); // enum(Suit::Hearts)
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?>
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]]>
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</programlisting>
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</example>
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</para>
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</refsect1>
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