Question

I need to add an entry to the superglobal $_SERVER-array within a PHP extension. I am quite sure that php_register_variable() will do the job, paasing key and value as arguments; but I have no idea what to pass as 3rd argument. Unfortunately documentation on this topic is rather sparse.

Answer 1

This is what I normally use:

zval** arr;
if (zend_hash_find(&EG(symbol_table), "_SERVER", 8, (void**)&arr) != FAILURE) {
    add_assoc_string(*arr, "foo", "bar", 1);
}

See Extension Writing Part II: Parameters, Arrays, and ZVALs for possible value types.