In Boston area alone there is 350 jobs advertised for PHP developer with salaries from 50k to 130k. 230 of those jobs are 70k+. 55 of them are 110k+ and 22 are 130k+.
That's just one metro area in the US. I'd say PHP is not quite dead yet.. Granted they expect you to know more than just PHP, but obviously it's still wanted.
http://www.indeed.com/jobs?q=php+dev...2C+MA&start=10