All sorts of tweaks to the manuscript
Fixed some missing PHP tags
More tweaking of PHP code samples
Still more tweaks of PHP code samples
Fixed typo in processIsolation XML variable
Fixed typo for the word 'trickier'
Added  member to match existing  member
Fixed typo of 'return' for Baz::mergeBar() method
Fixed missing paren when mocking Bar object
Added editor note for using stdClass in mock
Added another editor note for using stdClass in mock
Editor note about _ in protected/private member/method names
Fixed sample code for the reflection example
Removed stray apostrophe from array call
Added missing semicolon
Added PDO::FETCH_ASSOC to fetchAll() call in case some installs have the default changed
Added missing double-quote on assert message for serialization example
Editor not about _ in protected names
Changed json_decode to return array instead of object
Changed json_decode to return array instead of object to match other fix