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Case insensitivity no longer locale specific

All case insensitive matching for function, class and constant names is now performed in a locale independent manner according to ASCII rules. This improves support for languages using the Latin alphabet with unusual collating rules, such as Turkish and Azeri.

This may cause issues for code that uses case insensitive matches for non-ASCII characters in multibyte character sets (including UTF-8), such as accented characters in many European languages. If you have a non-English, non-ASCII code base, then you will need to test that you are not inadvertently relying on this behaviour before deploying PHP 5.5 to production systems.

pack() �� unpack() ��ı仯

Ϊʹ pack() �� unpack() �� Perl ��һЩ��

pack() ��֧��"Z"��ʽ��룬��ֵ��Ϊ��"a"��ͬ��
unpack() now support the "Z" format code for NULL padded strings, and behaves as "a" did in previous versions: it will strip trailing NULL bytes.��Ϊ��һ��汾�е�"a"�� NULL �ֽڡ�
unpack() now keeps trailing NULL bytes when the "a" format code is used.
unpack() now strips all trailing ASCII whitespace when the "A" format code is used.

Writing backward compatible code that uses the "a" format code with unpack() requires the use of version_compare(), due to the backward compatibility break.

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<?php
// ��ǰ�Ĵ��룺
$data = unpack('a5', $packed);

// �µĴ��룺
if (version_compare(PHP_VERSION, '5.5.0-dev', '>=')) {
  $data = unpack('Z5', $packed);
} else {
  $data = unpack('a5', $packed);
}
?>

�Ƴ� PHP logo GUIDs

The GUIDs that previously resulted in PHP outputting various logos have been removed. This includes the removal of the functions to return those GUIDs. The removed functions are:

php_logo_guid()
php_egg_logo_guid()
php_real_logo_guid()
zend_logo_guid()

Internal execution changes

Extension authors should note that the zend_execute() function can no longer be overridden, and that numerous changes have been made to the execute_data struct and related function and method handling opcodes.

Most extension authors are unlikely to be affected, but those writing extensions that hook deeply into the Zend Engine should read the notes on these changes.

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����֧�� Windows XP �� 2003