MySQL语法错误1064与PDO UPDATE语句（带有命名或未命名的占位符）返回WSOD

I'm well aware the fact that receiving the #1064 error points to invalid MySQL syntax, but the situation I find myself in hasn't been resolved by incessant trips to Manual-land, or the perusal of both SO (the PDO wiki in particular as well as the massive raft of related questions) and Google for the last five days. The problem being this PDO UPDATE statement;I'm well aware the fact that receiving the #106