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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision: 324122 $ -->
<sect1 xml:id="language.pseudo-types">
<title>Pseudo-types and variables used in this documentation</title>
<sect2 xml:id="language.types.mixed">
<title>mixed</title>
<para>
<literal>mixed</literal> indicates that a parameter may accept multiple (but
not necessarily all) types.
</para>
<para>
<function>gettype</function> for example will accept all PHP types, while
<function>str_replace</function> will accept <type>string</type>s and
<type>array</type>s.
</para>
</sect2>
<sect2 xml:id="language.types.number">
<title>number</title>
<para>
<literal>number</literal> indicates that a parameter can be either
<type>integer</type> or <type>float</type>.
</para>
</sect2>
<sect2 xml:id="language.types.callback">
<title>callback</title>
<para>
<type>callback</type> pseudo-types was used in this documentation before
<type>callable</type> type hint was introduced by PHP 5.4. It means exactly
the same.
</para>
</sect2>
<sect2 xml:id="language.types.void">
<title>void</title>
<para>
<literal>void</literal> as a return type means that the return value is
useless. <literal>void</literal> in a parameter list means that the function
doesn't accept any parameters.
</para>
</sect2>
<sect2 xml:id="language.types.dotdotdot">
<title>...</title>
<para>
<parameter>$...</parameter> in function prototypes means
<literal>and so on</literal>. This variable name is used when a function can
take an endless number of arguments.
</para>
</sect2>
</sect1>
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