Index: ext/spl/spl_dllist.c
===================================================================
RCS file: /repository/php-src/ext/spl/spl_dllist.c,v
retrieving revision 1.1.2.18
diff -u -p -r1.1.2.18 spl_dllist.c
--- ext/spl/spl_dllist.c	31 Dec 2008 11:15:43 -0000	1.1.2.18
+++ ext/spl/spl_dllist.c	15 Jun 2009 19:47:58 -0000
@@ -1036,6 +1036,16 @@ SPL_METHOD(SplDoublyLinkedList, key)
 }
 /* }}} */
 
+/* {{{ proto void SplDoublyLinkedList::prev() U
+   Move to next entry */
+SPL_METHOD(SplDoublyLinkedList, prev)
+{
+	spl_dllist_object *intern = (spl_dllist_object*)zend_object_store_get_object(getThis() TSRMLS_CC);
+
+	spl_dllist_it_helper_move_forward(&intern->traverse_pointer, &intern->traverse_position, intern->llist, intern->flags ^ SPL_DLLIST_IT_LIFO TSRMLS_CC);
+}
+/* }}} */
+
 /* {{{ proto void SplDoublyLinkedList::next() U
    Move to next entry */
 SPL_METHOD(SplDoublyLinkedList, next)
@@ -1164,6 +1174,7 @@ static const zend_function_entry spl_fun
 	SPL_ME(SplDoublyLinkedList, current,         NULL,                           ZEND_ACC_PUBLIC)
 	SPL_ME(SplDoublyLinkedList, key,             NULL,                           ZEND_ACC_PUBLIC)
 	SPL_ME(SplDoublyLinkedList, next,            NULL,                           ZEND_ACC_PUBLIC)
+	SPL_ME(SplDoublyLinkedList, prev,            NULL,                           ZEND_ACC_PUBLIC)
 	SPL_ME(SplDoublyLinkedList, valid,           NULL,                           ZEND_ACC_PUBLIC)
 	{NULL, NULL, NULL}
 };
Index: ext/spl/tests/dllist_010.phpt
===================================================================
RCS file: ext/spl/tests/dllist_010.phpt
diff -N ext/spl/tests/dllist_010.phpt
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ ext/spl/tests/dllist_010.phpt	15 Jun 2009 19:47:58 -0000
@@ -0,0 +1,27 @@
+--TEST--
+SPL: DoublyLinkedList: prev
+--FILE--
+<?php
+$dll = new SplDoublyLinkedList();
+$dll->push(1);
+$dll->push(2);
+$dll->push(3);
+$dll->push(4);
+
+
+$dll->rewind();
+echo $dll->current()."\n";
+$dll->next();
+$dll->next();
+echo $dll->current()."\n";
+$dll->prev();
+echo $dll->current()."\n";
+
+?>
+===DONE===
+<?php exit(0); ?>
+--EXPECTF--
+1
+3
+2
+===DONE===