postrm is in php7.2-json 7.2.3-1ubuntu1.
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 | #!/bin/sh
set -e
if [ "$1" = "remove" ]; then
    if [ -e /usr/lib/php/php-maintscript-helper ] ; then
	. /usr/lib/php/php-maintscript-helper
	for dsoname in json; do
	    php_invoke dismod 7.2 ALL ${dsoname}
	done
    fi
fi
if [ "$1" = "purge" ]; then
    inidir=/etc/php/7.2/mods-available
    for dsoname in json; do
	inifile=${dsoname}.ini
	for ext in '~' '%' .bak .ucf-new .ucf-old .ucf-dist;  do
	    rm -f ${inidir}/${inifile}${ext}
	done
	rm -f ${inidir}/${inifile}
	if which ucf >/dev/null; then
	    ucf --purge ${inidir}/${inifile}
	fi
	if which ucfr >/dev/null; then
	    ucfr --purge php7.2-json ${inidir}/${inifile}
	fi
	# 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
exit 0
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