You could just append new values to the file. 
echo '$i = 987;' >> parameter.ph

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That will override the old values.

If you do this often, and do not want the file to grow every time, save the original file and output to a new one. 

cp defaults.ph parameter.ph; echo '$i = 987;' >> parameter.ph

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In reply to Re^3: Changing parameters by Thilosophy
in thread Changing parameters by sparkel

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