Is there a trace facility for postgres/php?

Hi all,
    I am writing a php/postgres application.  I have been printing out 
commands and errors at each step of the way.  In the past I have used a 
trace facility to find out what the last SQL command the database ran. 
Is such a thing available in php/postgres?  I know how to get the most 
recent SQL error on a connection and print it out.

Thanks

Mary

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