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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.9 $ -->
<!-- splitted from ./en/functions/info.xml, last change in rev 1.71 -->
<refentry id="function.get-defined-constants">
<refnamediv>
<refname>get_defined_constants</refname>
<refpurpose>
Returns an associative array with the names of all the constants
and their values
</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<methodsynopsis>
<type>array</type><methodname>get_defined_constants</methodname>
<methodparam choice="opt"><type>mixed</type><parameter>categorize</parameter></methodparam>
</methodsynopsis>
<para>
This function 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>
<para>
For example the line below:
<informalexample>
<programlisting role="php">
<![CDATA[
<?php
print_r(get_defined_constants());
?>
]]>
</programlisting>
<para>
will print a list like:
</para>
<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>
</informalexample>
</para>
<para>
As of PHP 5, an additional parameter, <parameter>categorize</parameter>,
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>
<note>
<para>
The value of the <parameter>categorize</parameter> parameter is irrelevant,
only its presence is considered.
</para>
</note>
</para>
<para>
See also
<function>defined</function>,
<function>get_loaded_extensions</function>,
<function>get_defined_functions</function>, and
<function>get_defined_vars</function>.
</para>
</refsect1>
</refentry>
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