Description:
------------
I've just started to read through the migration documentation, and I thought 
that wouldn't find anything that I'm unfamiliar with, but obviously I've just 
found.
When I started to do my homework, I found out, that there are some changes, new 
features which aren't documented properly.
1,
http://www.php.net/manual/en/migration53.new-features.php
there should be a link or an example for the "Dynamic access to static methods 
is now possible."
Something like this:

<?php
class foo{
        public static $foo = 123;
}

$a = "foo";
echo $a::$foo;

2,
"Exceptions can now be nested."
I can nest exceptions with 5.2, so whats this about?

3,
"The mail() function now supports logging of sent email. (Note: This only 
applies to email sent through this function.)"
How?
I couldn't find anything about this in the mail function's documentation.
My best guess is the new mail.add_x_header ini directive.

4,
"A garbage collector for circular references has been added, and is enabled by 
default."
Could link to 
http://www.php.net/manual/en/info.configuration.php#ini.zend.enable-gc
OR
http://php.net/manual/en/features.gc.collecting-cycles.php


http://www.php.net/manual/en/migration53.ini.php

5,
"A new directive, mail.add_x_header, has been added."
should link to
http://www.php.net/manual/en/mail.configuration.php#ini.mail.add-x-header

6,
user_ini.filename and user_ini.cache_ttl 
should link to
http://php.net/manual/en/configuration.file.per-user.php

7,
exit_on_timeout - what is this?
there are zero documentation about this.
http://www.mail-archive.com/php-cvs@lists.php.net/msg33498.html

I think thats all that I found.