PHP 5 has already been out for more than three years now and version 6 is on it’s way. PHP developers recently announced on php.net that there will be no further releases of PHP version 4 although security fixes will continue on a case-by-case basis until August 8th 2008. PHP 4 scripts should be converted to version 5 by the end of 2007.
Conversion to PHP 5 has been really slow. According to Nexen.net for August 2007, 78% of websites are still using PHP 4. PHP 4.4.7 is still the popular choice while PHP 5.2.3 is good second.
PHP.net has a migration guide for PHP4 to PHP5 as well as guides for PHP 5.0 to 5.1 and PHP 5.1 to 5.2.
If you are using CentOS 4, I’ve written an article about migrating from PHP 4.3.9 to 5.1.6.
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