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Reply-To: "Erkka Marjakangas" <ede@iki.fi>
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Date: Wed, 3 Mar 2004 11:47:05 +0200
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Subject: Getting parent constructor called in a class chain - PHP 4.3.4 C extension
From: ede@iki.fi ("Erkka Marjakangas")

Hello!

Not sure if this is the most proper place for discussing PHP extensions, =
so blame me if I'm in a totally wrong place here ;-)

I'm sure this is as simple as standing up, but I just didn't stumble to =
the right place in documentation and searching the google didn't =
highlight anything either :-(

So I have a class creation/registering and rest working allright, with =
one thing missing...

How do I tell PHP (4.3.4) / Zend engine to automatically call parent =
constructors when creating a class that has parents in an extension?

Or if it cannot be done automatically, what would be the way to call the =
parent constructor?

I've got an extension with class chain similar to this PHP script:
class item {var $item_str; function test1(){}};
class stringitem extends item{var $stringitem_str; function test2(){}};

In PHP script with my extension I would create:
$test=3Dnew stringitem();

And it will get all the item's methods inherited automatically(test1 =
here), but the item constructor won't get called thus the item_str =
property will be missing ;-(

Registering the classes in C extension
---Code---
...
        INIT_OVERLOADED_CLASS_ENTRY(ce,"item",  =
php_item_class_functions,NULL,NULL,NULL);
        item_class_entry_ptr =3D zend_register_internal_class_ex(&ce, =
NULL,NULL TSRMLS_CC);

        INIT_OVERLOADED_CLASS_ENTRY(ce,"stringitem", =
php_stringitem_class_functions,NULL,NULL,NULL);
        stringitem_class_entry_ptr =3D =
zend_register_internal_class_ex(&ce, item_class_entry_ptr,NULL =
TSRMLS_CC);
...
ZEND_FUNCTION(item)
{        add_property_string(this_ptr, "item_str", =
"ThisIsItemClass",1);}

ZEND_FUNCTION(stringitem)
{
       //TODO: should I call item ctor manually here, if so, how? Can't =
it be automated?
        add_property_string(this_ptr, "stringitem_str", =
"ThisIsStringItemClass",1);
}
...
---Code---

I can always isolate the constructors to their own functions and call =
them manually in appropriate places to get properties of the parent =
class(es) initialized, but it sounds like a kludge and I' sure there's =
an automated way to do this since methods get inherited....

Thanks in advance!

Erkka Marjakangas
edeATikiDOTfi