postrm is in php-memcached 2.2.0-51-ge573a6e+2.2.0-2build2.
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 29 30 31 | #!/bin/sh
set -e
# Automatically added by dh_php
for conf in memcached; do
    dpkg-maintscript-helper rm_conffile /etc/php/mods-available/${conf}.ini -- "$@"
done
if [ "$1" = "remove" ]; then
    if [ -e /usr/lib/php/php-maintscript-helper ] ; then
	. /usr/lib/php/php-maintscript-helper
	
	for conf in memcached ; do
	    php_invoke dismod ALL ALL $conf || exit $?
	done
    fi
fi
if [ "$1" = "purge" ] ; then
    inidir=/etc/php/@PHP_VERSION@/mods-available
    for conf in memcached; do
	inifile=${conf}.ini
	# Final cleanup of possible leftover symlinks
	find /etc/php/ -type l | \
	    while read symlink; do
		if [ "$(readlink $symlink)" = "${inidir}/$inifile" ]; then
		    rm -f "${symlink}"
		fi
	    done
    done
fi
# End automatically added section
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