php-doc-en/reference/info/functions/get-defined-constants.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<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>bool</type><parameter>categorize</parameter><initializer>&false;</initializer></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>
       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
(
    [Core] => 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>
     </listitem>
    </varlistentry>
   </variablelist>
  </para>
 </refsect1>

 <refsect1 role="returnvalues">
  &reftitle.returnvalues;
  <para>
   Returns an array of constant name => constant value array, optionally
   groupped by extension name registering the constant.
  </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>5.3.1</entry>
       <entry>
        Windows only: Core constants are categorized under <literal>Core</literal>,
        previously <literal>mhash</literal>.
       </entry>
      </row>
      <row>
       <entry>5.3.0</entry>
       <entry>
        Core constants are categorized under <literal>Core</literal>,
        previously <literal>internal</literal>. On Windows, the Core Constants
        are categorized under <literal>mhash</literal>.
       </entry>
      </row>
      <row>
       <entry>5.2.11</entry>
       <entry>
        The <parameter>categorize</parameter> parameter now operates appropriately.
        Previously, the <parameter>categorize</parameter> parameter was interpreted
        as <literal>!is_null($categorize)</literal>, making any value other than &null;
        force the constants to be categorized.
       </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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