prerm is in php5-pspell 5.5.9+dfsg-1ubuntu4.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #!/bin/sh
set -e
if [ "$1" = "remove" ] || [ "$1" = "deconfigure" ]; then
    if [ -e /usr/share/php5/php5-maintscript-helper ] ; then
	. /usr/share/php5/php5-maintscript-helper
	for dsoname in pspell ; do
	    php5_invoke dismod ALL ${dsoname}
	done
    fi
fi
exit 0
 |