php/mapscript label question

[Jeff Portwine]

Is there any way to set the "labelitem" to look at a PHP variable rather than an actual attribute in the shapefile for the purpose of labeling?   In my case, I want to overlay route numbers on "sign" symbols.   The Tiger line data has street names shown like "State Highway 10" or whatever and I would like to read that in PHP and change it to just "10".    

I couldn't find any way to do what I want in the documentation so I may be stuck writing a script to go through every county's tiger data adding a column to the .dbf file... but I was hoping to avoid that extra scripting work if I could possibly do so. 

Thanks,
Jeff
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