redeclare function error

[Anon]

Here is the error that i get:

Fatal error: Cannot redeclare date_option() in global.php on line 47

i'm including that file in a number of pages, some of which are included on others. so i know why i'm getting the error. what i'm wondering is if there's any way to fix this, somewhat like the following in c++:

#ifndef GLOBAL_PHP
#define GLOBAL_PHP

#endif

thank you for the help in advance

[icaro]

php.net/include_once