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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.77 $ -->
<appendix xml:id="reserved" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<title>List of Reserved Words</title>
<para>
The following is a listing of predefined identifiers in PHP. None
of the identifiers listed here should be used as identifiers in any of
your scripts. These lists include keywords and predefined variable,
constant, and class names. These lists are neither exhaustive or
complete.
</para>
<sect1 xml:id="reserved.keywords">
<title>List of Keywords</title>
<simpara>
These words have special meaning in PHP. Some of them represent things
which look like functions, some look like constants, and so on--but
they're not, really: they are language constructs. You cannot use any
of the following words as constants, class names, function or method names.
Using them as variable names is generally OK, but could lead to confusion.
</simpara>
<table>
<title>PHP Keywords</title>
<tgroup cols="5">
<tbody>
<row>
<entry>
<link linkend="language.oop5.abstract">abstract</link> (as of PHP 5)
</entry>
<entry>
<link linkend="language.operators.logical">and</link>
</entry>
<entry>
<function>array</function>
</entry>
<entry>
<link linkend="control-structures.foreach">as</link>
</entry>
<entry>
<link linkend="control-structures.break">break</link>
</entry>
</row>
<row>
<entry>
<link linkend="control-structures.switch">case</link>
</entry>
<entry>
<link linkend="language.exceptions">catch</link> (as of PHP 5)
</entry>
<entry>
cfunction (PHP 4 only)
</entry>
<entry>
<link linkend="keyword.class">class</link>
</entry>
<entry>
<link linkend="language.oop5.cloning">clone</link> (as of PHP 5)
</entry>
</row>
<row>
<entry>
<link linkend="language.oop5.constants">const</link>
</entry>
<entry>
<link linkend="control-structures.continue">continue</link>
</entry>
<entry>
<link linkend="control-structures.declare">declare</link>
</entry>
<entry>
<link linkend="control-structures.switch">default</link>
</entry>
<entry>
<link linkend="control-structures.do.while">do</link>
</entry>
</row>
<row>
<entry>
<link linkend="control-structures.else">else</link>
</entry>
<entry>
<link linkend="control-structures.elseif">elseif</link>
</entry>
<entry>
<link linkend="control-structures.declare">enddeclare</link>
</entry>
<entry>
<link linkend="control-structures.alternative-syntax">endfor</link>
</entry>
<entry>
<link linkend="control-structures.alternative-syntax">endforeach</link>
</entry>
</row>
<row>
<entry>
<link linkend="control-structures.alternative-syntax">endif</link>
</entry>
<entry>
<link linkend="control-structures.alternative-syntax">endswitch</link>
</entry>
<entry>
<link linkend="control-structures.alternative-syntax">endwhile</link>
</entry>
<entry>
<link linkend="keyword.class">extends</link>
</entry>
<entry>
<link linkend="language.oop5.final">final</link> (as of PHP 5)
</entry>
</row>
<row>
<entry>
<link linkend="control-structures.for">for</link>
</entry>
<entry>
<link linkend="control-structures.foreach">foreach</link>
</entry>
<entry>
<link linkend="functions.user-defined">function</link>
</entry>
<entry>
<link linkend="language.variables.scope">global</link>
</entry>
<entry>
goto (as of PHP 5.3)
</entry>
</row>
<row>
<entry>
<link linkend="control-structures.if">if</link>
</entry>
<entry>
<link linkend="language.oop5.interfaces">implements</link> (as of PHP 5)
</entry>
<entry>
<link linkend="language.oop5.interfaces">interface</link> (as of PHP 5)
</entry>
<entry>
<link linkend="language.operators.type">instanceof</link> (as of PHP 5)
</entry>
</row>
<row>
<entry>
<link linkend="language.namespaces">namespace</link> (as of PHP 5.3)
</entry>
<entry>
<link linkend="keyword.class">new</link>
</entry>
<entry>
old_function (PHP 4 only)
</entry>
<entry>
<link linkend="language.operators.logical">or</link>
</entry>
<entry>
<link linkend="language.oop5.visibility">private</link> (as of PHP 5)
</entry>
</row>
<row>
<entry>
<link linkend="language.oop5.visibility">protected</link> (as of PHP 5)
</entry>
<entry>
<link linkend="language.oop5.visibility">public</link> (as of PHP 5)
</entry>
<entry>
<link linkend="language.variables.scope">static</link>
</entry>
<entry>
<link linkend="control-structures.switch">switch</link>
</entry>
<entry>
<link linkend="keyword.class">this</link> (as of PHP 5)
</entry>
</row>
<row>
<entry>
<link linkend="language.exceptions">throw</link> (as of PHP 5)
</entry>
<entry>
<link linkend="language.exceptions">try</link> (as of PHP 5)
</entry>
<entry>
<link linkend="language.namespaces">use</link>
</entry>
<entry>
<link linkend="keyword.class">var</link>
</entry>
<entry>
<link linkend="control-structures.while">while</link>
</entry>
</row>
<row>
<entry>
<link linkend="language.operators.logical">xor</link>
</entry>
<entry>
</entry>
<entry>
</entry>
<entry>
</entry>
<entry>
</entry>
</row>
</tbody>
</tgroup>
</table>
<table>
<title>Compile-time constants</title>
<tgroup cols="5">
<tbody>
<row>
<entry>
<link linkend="language.constants.predefined">__CLASS__</link>
</entry>
<entry>
<link linkend="language.constants.predefined">__DIR__</link> (as of PHP 5.3)
</entry>
<entry>
<link linkend="language.constants.predefined">__FILE__</link>
</entry>
<entry>
<link linkend="language.constants.predefined">__FUNCTION__</link>
</entry>
<entry>
<link linkend="language.constants.predefined">__METHOD__</link>
</entry>
</row>
<row>
<entry>
<link linkend="language.namespaces">__NAMESPACE__</link> (as of PHP 5.3)
</entry>
<entry>
</entry>
<entry>
</entry>
<entry>
</entry>
<entry>
</entry>
</row>
</tbody>
</tgroup>
</table>
<table>
<title>Language constructs</title>
<tgroup cols="5">
<tbody>
<row>
<entry>
<function>die</function>
</entry>
<entry>
<function>echo</function>
</entry>
<entry>
<function>empty</function>
</entry>
<entry>
<function>exit</function>
</entry>
<entry>
<function>eval</function>
</entry>
</row>
<row>
<entry>
<function>include</function>
</entry>
<entry>
<function>include_once</function>
</entry>
<entry>
<function>isset</function>
</entry>
<entry>
<function>list</function>
</entry>
<entry>
<function>require</function>
</entry>
</row>
<row>
<entry>
<function>require_once</function>
</entry>
<entry>
<function>return</function>
</entry>
<entry>
<function>print</function>
</entry>
<entry>
<function>unset</function>
</entry>
<entry>
</entry>
</row>
</tbody>
</tgroup>
</table>
</sect1>
<sect1 xml:id="reserved.classes">
<title>Predefined Classes</title>
<para>
This section lists standard predefined classes. Miscellaneous extensions
define other classes which are described in their reference.
</para>
<sect2 xml:id="reserved.classes.standard">
<title>Standard Defined Classes</title>
<simpara>
These classes are defined in the standard set of functions included
in the PHP build.
</simpara>
<variablelist>
<varlistentry>
<term><classname>Directory</classname></term>
<listitem>
<simpara>
The class from which <link linkend="class.dir">dir</link> is instantiated.
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>stdClass</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>__PHP_Incomplete_Class</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
</variablelist>
</sect2>
<sect2 xml:id="reserved.classes.php5">
<title>Predefined classes as of PHP 5</title>
<simpara>
These additional predefined classes were introduced in
PHP 5.0.0
</simpara>
<variablelist>
<varlistentry>
<term><classname>exception</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
<varlistentry>
<term><classname>php_user_filter</classname></term>
<listitem>
<simpara>
</simpara>
</listitem>
</varlistentry>
</variablelist>
</sect2>
</sect1>
&appendices.reserved.constants;
</appendix>
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