In a recent post to his blog, Davey Shafik looks at solving something that has "always bugged him about using prepared statements" - getting the actual query it used back out.

Today, a friend asking me if it was possible to get a prepared statement back from PDO with the values placeholders replaced, finally caught me in a moment where I could do something about it. I wrote a thin PDO wrapper class that will [imperfectly, I'm sure] return the completed query.

His class (complete code included in the post) includes a getSQL() method that hands you back the results of your bound parameter query as a string. A few examples of its use are also included.