Another Alpha Release for PHP

PHP 5.5 is now at Alpha 4. The PHP Team has decided to release another ALPHA release to public for testing. There are some noteworthy changes implemented on this release:

• Class Name Resolution as scalar via "class" keyword ,
• Added DateTimeImmutable class, a variant of DateTime that only returns the modified state instead of changing itself 

Besides these two new changes, the rest of the changes are bug fixes and it can be seen on this NEWS file