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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.12 $ -->
<refentry xml:id="function.get-defined-constants" xmlns="http://docbook.org/ns/docbook">
<refnamediv>
<refname>get_defined_constants</refname>
<refpurpose>Returns an associative array with the names of all the constants and their values</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>get_defined_constants</methodname>
<methodparam choice="opt"><type>mixed</type><parameter>categorize</parameter></methodparam>
</methodsynopsis>
<para>
Returns the names and values of all the constants currently defined.
This includes those created by extensions as well as those created with
the <function>define</function> function.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>categorize</parameter></term>
<listitem>
<para>
May be passed, causing this function to return a multi-dimensional
array with categories in the keys of the first dimension and constants
and their values in the second dimension.
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
define("MY_CONSTANT", 1);
print_r(get_defined_constants(true));
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
Array
(
[internal] => Array
(
[E_ERROR] => 1
[E_WARNING] => 2
[E_PARSE] => 4
[E_NOTICE] => 8
[E_CORE_ERROR] => 16
[E_CORE_WARNING] => 32
[E_COMPILE_ERROR] => 64
[E_COMPILE_WARNING] => 128
[E_USER_ERROR] => 256
[E_USER_WARNING] => 512
[E_USER_NOTICE] => 1024
[E_ALL] => 2047
[TRUE] => 1
)
[pcre] => Array
(
[PREG_PATTERN_ORDER] => 1
[PREG_SET_ORDER] => 2
[PREG_OFFSET_CAPTURE] => 256
[PREG_SPLIT_NO_EMPTY] => 1
[PREG_SPLIT_DELIM_CAPTURE] => 2
[PREG_SPLIT_OFFSET_CAPTURE] => 4
[PREG_GREP_INVERT] => 1
)
[user] => Array
(
[MY_CONSTANT] => 1
)
)
]]>
</screen>
</informalexample>
</para>
<note>
<para>
The value of the <parameter>categorize</parameter> parameter is irrelevant,
only its presence is considered.
</para>
</note>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
</para>
</refsect1>
<refsect1 role="changelog">
&reftitle.changelog;
<para>
<informaltable>
<tgroup cols="2">
<thead>
<row>
<entry>&Version;</entry>
<entry>&Description;</entry>
</row>
</thead>
<tbody>
<row>
<entry>5.0.0</entry>
<entry>
The <parameter>categorize</parameter> parameter was added.
</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>get_defined_constants</function> Example</title>
<programlisting role="php">
<![CDATA[
<?php
print_r(get_defined_constants());
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
<![CDATA[
Array
(
[E_ERROR] => 1
[E_WARNING] => 2
[E_PARSE] => 4
[E_NOTICE] => 8
[E_CORE_ERROR] => 16
[E_CORE_WARNING] => 32
[E_COMPILE_ERROR] => 64
[E_COMPILE_WARNING] => 128
[E_USER_ERROR] => 256
[E_USER_WARNING] => 512
[E_USER_NOTICE] => 1024
[E_ALL] => 2047
[TRUE] => 1
)
]]>
</screen>
</example>
</para>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>defined</function></member>
<member><function>get_loaded_extensions</function></member>
<member><function>get_defined_functions</function></member>
<member><function>get_defined_vars</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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