There are probably some improvements we can do to the SPL
implementation now that __autoload() is gone. In particular having
EG(autoload_func) as a property zend function, rather than a simple
callback probably doesn't make sense.
The $Id$ keywords were used in Subversion where they can be substituted
with filename, last revision number change, last changed date, and last
user who changed it.
In Git this functionality is different and can be done with Git attribute
ident. These need to be defined manually for each file in the
.gitattributes file and are afterwards replaced with 40-character
hexadecimal blob object name which is based only on the particular file
contents.
This patch simplifies handling of $Id$ keywords by removing them since
they are not used anymore.
spl_object_id is a new function returning the object handle,
as a signed integer.
Discussion for this new function is ongoing on php-internals, see
https://marc.info/?t=143835274500003&r=1&w=2
The object id is unique for the lifetime of the object.
When the object is garbage collected,
different objects may & will have the same object id.
- This is also the case for the string generated by spl_object_hash
It is always possible to cast the object handle to a **signed** zend_long
in php 7.2. _zend_object->handle is always of the type `uint32_t`.
(zend_long is 32 bits on 32 bit builds, 64 bits on 64 bit builds)
As of php 7.0, the object id uniquely identifies the object,
there can't be two objects with the same id but different handlers
(See the implementation of spl_object_hash)
Skip the pointless XORing, as discussed in internals.
- It was intended to avoid exposing in-memory addresses.
- The object handle is not a memory address.
- The output of var_dump() includes the object handle(id)
We still keep the same output length, for people who rely on the
return value having a specific format. The handler part will now
simply be always the same (it was the same nearly always anyway).
The motivation behind this change is to avoid breaking
spl_object_hash() and SplObjectStorage if an extension changes the
handlers table of an object. This has come up, for example, in
weakref implementations.
