R help - Jan 2011 - Capturing error messages while running R through an external program

I am trying to automate scoring done by applying 3 parameter model of IRT to
the response data. I call R from PHP to do this using exec(). Since I face
convergence issues while using R, it is important that the program captures
the error messages like "the solution is not stable" given by R while
running tpm().

How does one do that? I find sink() of no use to do that.

Regards,
Maulik

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