postrm is in php5-cli 5.3.10-1ubuntu3.
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 19 20 21 22 23 24 25 26 27 28 | #! /bin/sh
set -e
phpini=/etc/php5/cli/php.ini
case "$1" in
purge)
	# remove the flag to remember the original state
	if [ -e /etc/php5/cli/.start ]; then
	    rm -f /etc/php5/apache2/.start
	fi
	for ext in '~' '%' .bak .ucf-new .ucf-old .ucf-dist;  do
	    rm -f $phpini$ext
	done
	rm -f $phpini
	if which ucf >/dev/null; then
	    ucf --purge $phpini
	fi
	if which ucfr >/dev/null; then
	    ucfr --purge php5-cli $phpini
	fi
	;;
esac
exit 0
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