Returns an associative array with the names of all the constants and their values (original) (raw)

get_defined_constants

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

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

Description

get_defined_constants ([ bool $categorize = FALSE ] ) : array

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

Returns an array of constant name => constant value array, optionally groupped by extension name registering the constant.

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.

Examples

Example #1 get_defined_constants() Example

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