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Bugsnag (https://bugsnag.com) supports Rails, PHP, Python/Django, Nodejs, Android, iOS and Unity. Caveat: I'm a founder there.

We use Exceptional (exceptional.io) and Airbrake (airbrake.io). Both are fairly good but occasionally have discrepancies.

Agreed - the PHP world seems really short of such tools, which either means a) they're there and I've missed them, b) no one in PHP-land is interested in writing them, or c) Integrating w PHP's core is much harder than other languages.

For example, NewRelic's PHP support is still not on a par with their Rails support...

Squash has client libraries for Ruby, Objective-C, JavaScript, and preliminary Java support.

(self plug) Check out http://ratchet.io - we have libraries for PHP, Django/python, and Node.js, as well as Rails, client-side JS, and Flash.