(PHP 4 >= 4.1.0)get_defined_constants -- Returns an associative array with the names of all the constants and their values
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:
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 )