title: List of highly-regarded PHP style guides?
body: <p>I've recently been shaking up my coding habits and have been toying with various approaches to coding style... things like using a space between method call parentheses and the parameters they contain, how to deal with multi-line array definitions and method calls, etc.</p>
  
  <p>I'm wary of creating my personal flavor of everything, though, and want to skim through some well-regarded "authoritative" style guides.  Which ones should I look at?  I've had a hard time finding much other than the Zend guide.</p>