get_defined_constants Returns an associative array with the names of all the constants and their values Description arrayget_defined_constants mixedcategorize 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 define function. For example the line below: ]]> will print a list like: 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 ) ]]> As of PHP 5, an additional parameter, categorize, 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. ]]> &example.outputs.similar; 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 ) ) ]]> The value of the categorize parameter is irrelevant, only its presence is considered. See also defined, get_loaded_extensions, get_defined_functions, and get_defined_vars.