PHP is an astonishingly inept language with an inexhaustible supply of WTF, but not necessarily a bad short-term career move. I think the industry might see a mini-COBOL phase as some really flaky yet successful legacy PHP needs to be maintained and finally replaced, and nobody smart wants to deal with it without being paid well. You'd definitely want to stay sharp on something better, though, both for sanity and to remain employable long-term.