postrm is in php-smbclient 0.8.0~rc1-2.
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 | #!/bin/sh
set -e
# Automatically added by dh_php
if [ "$1" = "purge" ] ; then
    if [ -e /usr/lib/php/php-maintscript-helper ] ; then
	. /usr/lib/php/php-maintscript-helper
	for conf in smbclient  ; do
	    php_invoke dismod ALL ALL $conf || exit $?
	done
    else
	if [ -x /usr/sbin/phpdismod ]; then 
	    for conf in smbclient  ; do
	        phpdismod $conf
	    done
	else
	    echo "WARN: php-common has been removed, you need to cleanup /etc/php yourself."
	fi
    fi
fi
# End automatically added section
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