Like this? I'm assuming that I wouldn't have to make any other changes to the code.
PHP Code:
decl String:steamID[20], String:ipAddress[16], String:oldName[33], String:newName[33];
ipAddress[0] = '\0';
steamID[0] = '\0';
EDIT: Actually, I can probably just use the returns of the two functions to decide on whether or not to even print the information.