php3_asp_tags On
   |
   V
<IfModule mod_php3.c>
php3_asp_tagsOn
</IfModule>
<IfModule mod_php4.c>
php_admin_flag asp_tags on
</IfModule>

LoadModule php3_module        /usr/lib/apache/libphp3.so
   |
   V
<IfModule mod_php3.c>
LoadModule php3_module
</IfModule>
<IfModule mod_php4.c>
php_admin_value odule php3_module        /usr/lib/apache/libphp3.so
</IfModule>

I've done some *very* small fixes on conffix.awk.
looks like working.
---
/php3_.*/ && !/php3_module/ {
        phpcommand=substr($1,6)
        phpvalue=tolower($2)
        print "<IfModule mod_php3.c>"
        print $1 " " $2
        print "</IfModule>"
        print "<IfModule mod_php4.c>"
        if (phpvalue=="on") {
                print "php_admin_flag " phpcommand " on"
        } else  if (phpvalue=="off") {
                print "php_admin_flag " phpcommand " off"
        } else {
                print "php_admin_value " phpcommand " " substr($0,index($0,$1)+length($1)+1)
        }
        print "</IfModule>"
}

! /php3_.*/  || /php3_module/{
        print $0
}