Commiting r311138 into the 5.3 branch - fix to SimpleXML get properties hash

Use iterator when necessary to get the full properties hash - consistent with count (see test: ext/simplexml/tests/034.phpt)

- Updated UPGRADING now that multicast support was decided
trunk only.

* added detection and walkaround for net-snmp library bug (net-snmp BUGid 2027834)
* drop UCD-SNMP support, R.I.P.

- Improved upon r309729.
- Extented strategy to remaining the classes on spl_directory.c, even those that don't crash.
- UPGRADING.
- Better bug54384.phpt, with all the classes covered.

UPGRADING

added info about changes in SNMP extension

- Updating UPGRADING for r309516 and modest merge to 5.3.

- Make fclose() actually close stream, even when the resource refcount is > 1.
This reverts the fix for bug #24557.
- Make php_stream_free delete the stream from the resources list, not mer

- Make fclose() actually close stream, even when the resource refcount is > 1.
This reverts the fix for bug #24557.
- Make php_stream_free delete the stream from the resources list, not merely
decrease its refcount, as a single call to zend_list_delete does.
#Not worth the risk merging to 5.3. While change #2 may prevent some segfaults,
#a quick and dirty survey to the codebase only showed calls to php_stream_close
#or php_stream_free on streams allocated in the same function, which would have
#refcount == 1. May be reconsidered.

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- PHP_STREAM_OPTION_WRITE_BUFFER no longer disables the read buffer of a plain
stream when 0 is given as the value.
- PHP_STREAM_OPTION_WRITE_BUFFER no longer changes the chunk size in sock

- PHP_STREAM_OPTION_WRITE_BUFFER no longer disables the read buffer of a plain
stream when 0 is given as the value.
- PHP_STREAM_OPTION_WRITE_BUFFER no longer changes the chunk size in socket
streams.
- Added stream_set_chunk_size() function.
- Some signedness fixes.
- Test for commit r308474, now that it's possible to actually test it.

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- Classes that implement stream wrappers can define a method called
stream_truncate that will respond to truncation, e.g. through ftruncate.
Closes feature request #53888.

Oopsie, fix typo in UPGRADING

MFH - Added SplFileInfo::getExtension() (FR #48767)

Revert the UPGRADING change in r307807, since it's actually completely pointless, as Johannes pointed out.

Fixed bug #53854 (Missing constants for compression type). Patch by Richard
Quadling.

- Fixed CHARSET_UNICODE_COMPAT (ISO-8859-1 is compatible in the relevant sense).
- Fixed usage of zend_multibyte_get_internal_encoding (its return cannot be
cast to char*).
- Change tes

- Fixed CHARSET_UNICODE_COMPAT (ISO-8859-1 is compatible in the relevant sense).
- Fixed usage of zend_multibyte_get_internal_encoding (its return cannot be
cast to char*).
- Change tests to reflect that charset detection now relies on
internal_encoding, not on current_internal_encoding.
NOTE: This fixes the changes in rev 306077, but it remains that that change
introduced a BC break. I assumed it was intentional

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Fixed a couple of trivial typos

Added 'catalog' to the field fetching functions in mysqli (Thanks to Johannes for the headsup)

MFT: Implemented FR #47802 (Support for setting character sets in DSN strings)

Added trait_exists() [TRAITS] [DOC]

- also changed class_exists() to return false for traits
- added related tests, and get_declared_traits() tests in ext/s/t/co

Implemented FR #39847 (mysqli_fetch_[field|fields|field_direct] need to return db)

Implemented FR #47802, support for character sets in DSN strings for PDO_MYSQL

Implement request #53659 (Implementing RegexIterator::getRegex() method). Patch
by Joshua Thijssen.

Silently casting an empty string, null or false into an object by adding a property
is pretty non-intuitive. If the same value was 1 or true you get a warning and it halts.

Since we can'

Silently casting an empty string, null or false into an object by adding a property
is pretty non-intuitive. If the same value was 1 or true you get a warning and it halts.

Since we can't break BC completely (yet) lets bump this from E_STRICT.

Also added a new section to UPGRADING for engine changes.

<?php
$x = '';
// $x = null;
// $x = false;
$x->baz = 1;
var_dump($x);

$y = 1;
$y->baz = 1;
var_dump($y);

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Implemented FR #48767 (SplFileInfo::getExtension())