The first argument passed to eregi_replace is
" ".$keywords[$i]." "
You are concatenating the string and a space on the end and front. This was
obviously used as a hack to make sure only full words were highlighted. A
fix for this? A simple hack would be to take out the spaces, so it is simply
$keywords[$i], although you could figure out a proper regex if you don't
want partial words higlighted.
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