INCLUDE FUNCTION IN PHP

OI, It forgives my English, I am using Babel translating Fish, I am Brazilian... I and a friend we are university and we are developing one script of criptografia to be used in PHP, are in you make final of creation but we would like to inlay in language PHP of our server this function of criptografia. initially to test, after successful we like to know as to send this modification or inclusion for the new versions of the global PHP. But initially we like to know as to inlay this function in the original códio of the PHP. similar md5, example: $var = minhafunçao("string") echo $var abraços. initially only in our server, the version php installed in our server. good bye -- Atenciosamente, Gerson Felipe