The latest versions of PHP can be downloaded from Softpedia
PHP, an HTML-embedded scripting language with syntax borrowed from C, Java and Perl with a couple of unique PHP-specific features thrown in, has been updated to version 5.5.0 Alpha 4.Highlights for PHP 5.5.0 Alpha 4:
• Object members got trimmed by zero bytes;
• RFC has been implemented for Class Name Resolution As Scalar Via "class" Keyword;
• DateTimeImmutable has been added (a variant of DateTime that only returns the modified state instead of changing itself);
• Locale number format settings no longer can cause pg_query_params to break with numerics.
You can check out the official changelog in the readme file incorporated in the source package.
Download PHP 5.5.0 Alpha 4 right now from Softpedia. Remember that this is a beta version and it should NOT be installed on production machines. It is intended for testing purposes only.