function signatures in XML

Heya, Does PHP store somewhere meta-information of all internal functions (and operators) in a portable format such as XML? I would like to extract information such as - parameters including types - return type automatically. Preferably each overload of a function but I guess that does not exist. For instance, str_replace has overloads: string x string x string x (&int) -> string string x string x array x (&int) -> array array x string x string x (&int) -> string array x array x string x (&int) -> string array x array x array x (&int) -> array Unfortunately, the manual as such is not precise enough for my needs. Cheers, Robert