Description:
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Please make PHP_FUNCTION(dba_close) return true for success, and raise a warning and return false on failure, as per the usual PHP convention.

PHP_FUNCTION(dba_close) calls zend_list_delete(), which doesn't provide any way for the handlers to report errors either via php_error_docref() or by returning false to the caller.

Some handlers (such as CDB) write a large amount of data to disk on close, and so a disk full error can easily be encountered, e.g.
https://bugzilla.wikimedia.org/show_bug.cgi?id=33409

You could change the prototype for dba_handler.close and dba_close() to return int, and you could make PHP_FUNCTION(dba_close) call dba_close() directly before destroying the resource. dba_close() would need to be modified slightly to avoid dangling pointers.