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<?xml version="1.0" encoding="utf-8"?>
<sect1 xml:id="language.types.value">
<title>Value types</title>
<para>
Value types are those which not only check the type of a value but also
the value itself. PHP has support for two value types:
<type>false</type> as of PHP 8.0.0, and <type>true</type>
as of PHP 8.2.0.
</para>
<warning>
<simpara>
Prior to PHP 8.2.0 the <type>false</type> type could only be used as part of a
<link linkend="language.types.type-system.composite.union">union type</link>.
</simpara>
</warning>
<note>
<simpara>
It is not possible to define custom value types. Consider using an
<link linkend="language.types.enumerations">enumerations</link> instead.
</simpara>
</note>
</sect1>
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