Update howto

diff --git a/Zend/OBJECTS2_HOWTO b/Zend/OBJECTS2_HOWTO
index 9a0222e313a4d6fe3ae9d9ccd2b4211cfbf5a737..4e627c1eeb70abff538b2e8cdaff9cc9e0b626ee 100644 (file)
--- a/Zend/OBJECTS2_HOWTO
+++ b/Zend/OBJECTS2_HOWTO
@@ -48,13 +48,19 @@ Object access - write
 ---------------------
 
 write_property is used to directly write object's property by
-name. This handler is not oftenly used by the engine itself, but may
-be used by some internal functions.
+name.  This handler is used to assign property variables or to change them 
+in operations like += or ++ (unless get_property_zval_ptr is also set).
+
+get_property_zval_ptr is used to obtain pointer to modifyable zval for 
+operations like += or ++. This should be used only if your object model 
+stores properties as real zval's that can be modified from outside. 
+Otherwise this handler should be NULL and the engine will use 
+read_property and write_property instead.
 
 get_property_ptr is used to obtain zval ** for future writing to
 it. If your object properties are stored as zval*, return real place
 where the property is stored. If the aren't, the best way is to create 
-proxy object and handle it via get and set methods (see below).
+proxy object and handle it via get and set methods (see below). 
 
 get and set handlers are used when engine needs to access the object
 as a value. E.g., in the following situation:
@@ -117,6 +123,7 @@ typedef struct _zend_object_handlers {
        zend_object_read_property_t              read_property;
        zend_object_write_property_t             write_property;
        zend_object_get_property_ptr_t           get_property_ptr;
+       zend_object_get_property_zval_ptr_t      get_property_zval_ptr;
        zend_object_get_t                        get;
        zend_object_set_t                        set;
        zend_object_has_property_t               has_property;
@@ -149,6 +156,9 @@ reading.
 
 write_property - assigns value to certain property of the object. 
 
+get_property_zval_ptr - retrieves zval** for being directly modified by 
+the engine. If your properties are not zval's, don't define it.
+
 get_property_ptr - retrieves zval** for the property of the value, to
 be used for read and write. If object properties are not zval's
 natively, this method should create and return proxy object for use