Some small problems with php5.4.0

The evening has just updated php5.4.0, the environment is WINDOWS7 + Apache2.2 + MySQL5.1 + Php5.4.0,php.ini no re-update, still using the previous version (php5.2)
Title, there are two minor problems:

1,php5.4.0 namespace-space issues:

Appear:
Fatal Error:namespace declaration statement have to is the very first statement in the script in F:\htdocs\rules.php on Li NE 2
What's the problem??? How to declare it is useless .... The code for the direct copy of the manual also went wrong .... Is php5.4 own mistake or I configure the problem??

2, directly paste code it:

$phpinfo = function () {echo ' Hello world! ';} Phpinfo (); $phpinfo ();

Error code: Parse error:syntax Error, unexpected ' phpinfo ' (t_string)
I don't think that's a problem. Just want to know why it is so. If the direct overwrite will produce a fatal error directly in the letter declaration, but here can execute normally, and directly overwrite the PHP built-in method (although not normal output), this should not only be in 5.4, I believe in other versions of the same, is a bug?? Thank you
Besides, can you give me some features of version 5.4?
A long time did not knock PHP, are a little rusty, let alone to understand the new features of PHP ....
Thanks again!

Reply to discussion (solution)

There is one more problem.
PHP warning:php Startup:invalid Library (maybe not a PHP library) ' Libmcrypt.dll ' in Unknown on line 0
PHP warning:php startup:unable to load Dynamic library '. /php/ext\php_iconv.dll '-Contains invalid paths
In Unknown on line 0

How does this work? Call Php.exe debug output in UE, but normal use no problem .... Very depressed, dos why the error ....
(Note: My own configuration of the mobile configuration, before the error, put Libmcrypt.dll and php_iconv.dll into the/windows directory available, now but also error, depressed ....) ）

1. The error message is clear, it is estimated that your program has a BOM header. 2. This is to assign a value to the $phpinfo, so the end of the line with a semicolon to properly close.
3. Error hints give you the path you see right

The first one should be the BOM header problem
The second one just defines $phpinfo is an anonymous function, and phpinfo () does not have a half-dime relationship, and does not cover the phpinfo (), followed by '; ' is normal.
The new feature supports the following syntax:

Short array Syntax$a=[1,2,3,4,5,6];//array dereferencingfunction foo () {return array (1,2,3,4);} echo foo () [1];

and buid-in Web server and traits downstairs to add

Confirm question one: it is indeed the UTF-8 BOM header problem that has been resolved:
UE Save with Format UTF-8 no BOM, done!
Extension problem two: after the quotation mark removal can be called correctly, but why do not add quotation marks without error??

I also ran into a problem, but mine was because the first line wrote ' #! /bin/env php '
Language changes are difficult to few words, you'd better check the documentation.
Here's what I checked for PHP changes from 5.3 to 5.4
http://www.php.net/manual/zh/migration54.php

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