PHP has announced that they will stop supporting PHP4 until the end of this year and critical security fixes will be available on a case-by-case basis only until 8 August 2008 (nice number they pick on this one). They have prepared all the documentation required to upgrade to PHP 5.x (recommended is 5.2.x) and there's also a site, called GoPHP5 to help the migration campaign. In the site, every project listed there has agreed to have a minimum version requirement of at least PHP 5.2.0. It includes several big projects, such as PEAR, PHPMyAdmin, phpUnit, Gallery, and some hosting providers.
For web hosting, this might cause some problems, since PHP5 has a lot of changes and it may break compatibility with PHP4, so it's recommended that the web hosting owner start sending emails to the customer and tell them that the PHP application will be upgraded to PHP5 and the users are urged to test their site to be compliant to PHP5. They have about half a year to do so. I think it's more than enough to re-check their site again to be PHP5 compliance.
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