List of PHP object handler found in PHP 5.4.10 (by Gynvael Coldwind) Please note that I might have missed something. Also, most of these inherit the handlers from std_object_handlers, and then switch one or two functions. php_com_object_handlers helper_handlers php_com_saproxy_handlers php_com_object_handlers date_object_handlers_date date_object_handlers_timezone date_object_handlers_interval date_object_handlers_period dom_object_handlers finfo_object_handlers Collator_handlers IntlDateFormatter_handlers NumberFormatter_handlers MessageFormatter_handlers ResourceBundle_object_handlers Spoofchecker_handlers Transliterator_handlers mysqli_object_handlers pdo_dbh_object_handlers pdo_dbstmt_object_handlers pdo_row_object_handlers reflection_object_handlers sxe_object_handlers php_snmp_object_handlers spl_handler_ArrayObject spl_handler_ArrayIterator spl_filesystem_object_handlers spl_filesystem_object_check_handlers spl_handler_SplDoublyLinkedList spl_handler_SplFixedArray spl_handler_SplHeap spl_handler_SplPriorityQueue spl_handlers_rec_it_it spl_handlers_dual_it spl_handler_SplObjectStorage sqlite3_object_handlers sqlite3_stmt_object_handlers sqlite3_result_object_handlers php_incomplete_object_handlers tidy_object_handlers_doc tidy_object_handlers_node xmlreader_object_handlers xmlwriter_object_handlers xsl_object_handlers zip_object_handlers closure_handlers default_exception_handlers iterator_object_handlers zend_object_proxy_handlers std_object_handlers