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

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<!-- $Revision: 1.10 $ -->
<!-- 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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