On Tue, Sep 22, 2015 at 11:16:46AM -0700, j adams wrote: > I'm working on a data serialization routine wherein I must iterate through > an object's properties while distinguishing between "sealed" properties > (i.e., those specified by class definitions) and "dynamic" properties" > (i.e., those assigned ad-hoc to some object that are not party of any class > definition). > > I found the source of the php function get_object_vars(): > http://lxr.php.net/xref/PHP_5_6/Zend/zend_builtin_functions.c#985 > However, I am still pretty confused. PHP source is *full* of macros and has > basically no comments. Hoping for some tips to keep me on the right track. > I'm pretty sure I can get something kludgy working, but I want my code to > be orthodox and work well. > > QUESTIONS > 1) Sadly, this approach is unable to distinguish "sealed" properties from > dynamic ones. If anyone can refer me to some source (or outline a general > approach) which can first iterate sealed properties and then iterate only > dynamic ones, that would be extremely helpful. > > 2) What does zend_objects_get_address do? This reference looks very > different than the usual macro, e.g. Z_OBJ_HT_P > > 3) Am I correct in understanding that zend_check_property_access simply > checks if the property in question is availabe in the scope in which this > function call gets executed? Is this the canonical/orthodox way to make > this check? > > 4) What does zend_unmangle_property_name do? Why is this function changed > to zend_unmangle_property_name_ex in 5.5 and later? > > 5) Why do we call Z_ADDREF_PP(value) here? Is this reference counting to > prevent garbage collection? > > 6) An IS_INTERNED check is added in php 5.6 and yet the macro for > IS_INTERNED is zero. What's that all about? > > 7) The code looks quite different between the different versions: > 5.3 - http://lxr.php.net/xref/PHP_5_3/Zend/zend_builtin_functions.c#950 > 5.5 - http://lxr.php.net/xref/PHP_5_5/Zend/zend_builtin_functions.c#982 > 5.6 - http://lxr.php.net/xref/PHP_5_6/Zend/zend_builtin_functions.c#985 > From what I can tell there is at least one difference between 5.3 and 5.6 > -- zend_unmangle_property_name_ex does not exist before 5.5. Can anyone > recommend how to make code that'll work in 5.3-5.6? Also, with 7 coming out > I'd like it work there too. > > Any answers or assistance would be greatly appreciated. Hey,
1) 'Default Properties' or properties stored on the class (not object) can be found on the zend_class_entry[0], they are just accessed by offset [1] This isn't a stable/public API, but good for a cool hack! 3) Never used this, but it seems to be to confirm that a mangled prop name matches a zend_property_info * 4) [2] Is some good reading on property name mangling 5) [3] Pretty much! Refcount is just to keep track of when a zval can be destroyed Hopefully the more educated members of the list can follow up and fix my errors, but for now that will at least get you going/able to dive deeper. [0] http://lxr.php.net/xref/PHP_5_6/Zend/zend.h#488 [1] http://lxr.php.net/xref/PHP_5_6/ext/reflection/php_reflection.c#3410 [2] http://www.phpinternalsbook.com/classes_objects/internal_structures_and_implementation.html [3] http://www.phpinternalsbook.com/zvals/memory_management.html -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
