Description:
------------
The ./configure command used to configure php is pretty printed in multiple places; at least in config.nice and in phpinfo / php -i. This includes arguments and environment variables like CFLAGS.

The config.nice file is created by ./configure, and is super-useful as it allows to quickly re-run configure with additional arguments or modified environment variables. 

Environment variables are not properly pretty-printed. As a result, running the pretty-printed command doesn't give the same result as the original command.

Test script:
---------------
$ CFLAGS="-O0 -ggdb -Wall" ./configure --enable-debug
$ cat config.nice

Expected result:
----------------
#! /bin/sh
#
# Created by configure

CFLAGS='-O0 -ggdb -Wall' \
'./configure' \
'--enable-debug' \
"$@"


The command is correctly pretty-printed, and running it gives the same result as the original command.

Actual result:
--------------
#! /bin/sh
#
# Created by configure

CFLAGS='-O0 -ggdb -Wall' \
'./configure' \
'--enable-debug' \
'CFLAGS=-O0 \
'-ggdb' \
'-Wall'' \
"$@"

Running the command results in the following error:

configure: error: C compiler cannot create executables
See `config.log' for more details
configure: WARNING: cache variable ac_cv_env_CFLAGS_value contains a newline