First we fetch the argument the user passed in. If the wrong number of arguments were passed in, this will throw an error. Next we assume the argument is an array. If it isn't, we check if it is a string and make a copy of it. type == IS_STRING) { convert_to_string_ex(arg); str = estrndup((*arg)->value.str.val,(*arg)->value.str.len); } else { php_error(E_WARNING, "Wrong datatype in get_stocks() call"); } }]]> Now, if it was an array, we need to write code that will loop through this array and create a string in the form of "LNUX+RHAT+IBM+SUNW"