void init_executor(void) /* {{{ */
{
	zend_init_fpu();

	ZVAL_NULL(&EG(uninitialized_zval));
	ZVAL_NULL(&EG(error_zval));
/* destroys stack frame, therefore makes core dumps worthless */
#if 0&&ZEND_DEBUG
	original_sigsegv_handler = signal(SIGSEGV, zend_handle_sigsegv);
#endif

	EG(symtable_cache_ptr) = EG(symtable_cache) - 1;
	EG(symtable_cache_limit) = EG(symtable_cache) + SYMTABLE_CACHE_SIZE - 1;
	EG(no_extensions) = 0;

	EG(function_table) = CG(function_table);
	EG(class_table) = CG(class_table);

	EG(in_autoload) = NULL;
	EG(autoload_func) = NULL;
	EG(error_handling) = EH_NORMAL;

	zend_vm_stack_init();

	zend_hash_init(&EG(symbol_table), 64, NULL, ZVAL_PTR_DTOR, 0);
	EG(valid_symbol_table) = 1;

	zend_llist_apply(&zend_extensions, (llist_apply_func_t) zend_extension_activator);

	zend_hash_init(&EG(included_files), 8, NULL, NULL, 0);

	EG(ticks_count) = 0;

	ZVAL_UNDEF(&EG(user_error_handler));

	EG(current_execute_data) = NULL;

	zend_stack_init(&EG(user_error_handlers_error_reporting), sizeof(int));
	zend_stack_init(&EG(user_error_handlers), sizeof(zval));
	zend_stack_init(&EG(user_exception_handlers), sizeof(zval));

	zend_objects_store_init(&EG(objects_store), 1024);

	EG(full_tables_cleanup) = 0;
#ifdef ZEND_WIN32
	EG(timed_out) = 0;
#endif

	EG(exception) = NULL;
	EG(prev_exception) = NULL;

	EG(scope) = NULL;

	EG(ht_iterators_count) = sizeof(EG(ht_iterators_slots)) / sizeof(HashTableIterator);
	EG(ht_iterators_used) = 0;
	EG(ht_iterators) = EG(ht_iterators_slots);
	memset(EG(ht_iterators), 0, sizeof(EG(ht_iterators_slots)));

	EG(active) = 1;
}
/* }}} */

The product uses a function that accepts a format string as an argument, but the format string originates from an external source.