If Facebook can get Hack to go mainstream, PHP may have a second chance. But for now, it seems like PHP is dying. There are now 2x more Ruby jobs than PHP in the Bay Area. Here's a link to Google Trends for PHP

Worldwide: http://www.google.com/trends/explore#q=php%2C%20ruby%2C%20py...

US: http://www.google.com/trends/explore#q=php,+ruby,+python,+pe...

Bay Area: http://www.google.com/trends/explore#geo=807&q=php,+ruby,+py...

I have the most experience in PHP, but I've been purposefully avoiding it lately just in case it becomes Perl. I've been using Node lately and will probably start using Ruby.