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Returns an associative array with the names of all the constants and their values


get_defined_constants

(PHP 4 >= 4.1.0, PHP 5)

get_defined_constantsReturns an associative array with the names of all the constants and their values

Description

array get_defined_constants ([ bool $categorize = false ] )

Returns the names and values of all the constants currently defined. This includes those created by extensions as well as those created with the define() function.

Parameters

categorize

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.

<?php
define
("MY_CONSTANT"1);
print_r(get_defined_constants(true));
?>

The above example will output something similar to:

 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   ) ) 

Return Values

Changelog

Version Description
5.3.1 Windows only: Core constants are categorized under Core, previously mhash.
5.3.0 Core constants are categorized under Core, previously internal. On Windows, the Core Constants are categorized under mhash.
5.2.11 The categorize parameter now operates appropriately. Previously, the categorize parameter was interpreted as !is_null($categorize), making any value other than NULL force the constants to be categorized.
5.0.0 The categorize parameter was added.

Examples

Example #1 get_defined_constants() Example

<?php
print_r
(get_defined_constants());
?>

The above example will output something similar to:

 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 ) 

See Also



Content

Android Reference

Java basics

Java Enterprise Edition (EE)

Java Standard Edition (SE)

SQL

HTML

PHP

CSS

Java Script

MYSQL

JQUERY

VBS

REGEX

C

C++

C#

Design patterns

RFC (standard status)

RFC (proposed standard status)

RFC (draft standard status)

RFC (informational status)

RFC (experimental status)

RFC (best current practice status)

RFC (historic status)

RFC (unknown status)

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