postrm is in php7.0-fpm 7.0.4-7ubuntu2.
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 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | #!/bin/sh
set -e
dpkg-maintscript-helper mv_conffile /etc/php5/fpm/main.conf /etc/php5/fpm/php-fpm.conf 5.3.5-1 -- "$@"
php_enable() { return 0; }
if [ "$1" = "remove" ]; then
    if [ -e /usr/lib/php/php-maintscript-helper ]; then
	. /usr/lib/php/php-maintscript-helper
	mods=$(phpquery -M -v 7.0)
	for mod in $mods; do
	    php_invoke dismod 7.0 fpm $mod
	done
    else
	for mod in /etc/php/7.0/conf.d/*.ini; do 
	    rm -f $mod
	    for ext in '~' '%' .bak .ucf-new .ucf-old .ucf-dist;  do
		rm -f $mod$ext
	    done
	done
    fi
fi
if [ "$1" = "purge" ]; then
    phpini=/etc/php/7.0/fpm/php.ini
    # remove the flag to remember the original state
    if [ -e /etc/php/7.0/fpm/.start ]; then
	rm -f /etc/php/7.0/fpm/.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 php7.0-fpm $phpini
    fi
    for dir in \
	/etc/php/7.0/fpm/conf.d \
	/etc/php/7.0/fpm \
	/etc/php/7.0/ \
	/etc/php; do
	
	if [ -d $dir ]; then
	    rmdir --ignore-fail-on-non-empty $dir
	fi
    done
fi
# Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d php7.0-fpm remove >/dev/null
fi
# In case this system is running systemd, we make systemd reload the unit files
# to pick up changes.
if [ -d /run/systemd/system ] ; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
# Automatically added by dh_systemd_enable
if [ "$1" = "remove" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper mask php7.0-fpm.service >/dev/null
	fi
fi
if [ "$1" = "purge" ]; then
	if [ -x "/usr/bin/deb-systemd-helper" ]; then
		deb-systemd-helper purge php7.0-fpm.service >/dev/null
		deb-systemd-helper unmask php7.0-fpm.service >/dev/null
	fi
fi
# End automatically added section
# Automatically added by dh_apache2
if [ "$1" = "purge" ] ; then
	if php_enable; then
		if [ -e /usr/share/apache2/apache2-maintscript-helper ] ; then
			. /usr/share/apache2/apache2-maintscript-helper
			for conf in php7.0-fpm  ; do
				apache2_invoke disconf $conf  || exit $?
			done
		fi
	fi
fi
# End automatically added section
exit 0
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