This readme covers building Mapserver from scratch on Windows.
We will download current development state of php.
If you need MapscriptNG for a different version of php, you have to fit the commands below.
For the first time, it is a good idea to build as shown below and after you have a working state, you can change whatever you want, knowing there is a working state you can return to.

All you need is Visual Studio 2017 Express (latest Version, check for updates) and GIT installed.

To begin, start x64 or x86 Native Tools Command Prompt for VS 2017 and just execute all Commands listed below.
Please always stay inside PHP-SDK-Shell to have wget and unzip available.

rem --------------------------------------------------------------------
rem Step 1: Create Directories
rem --------------------------------------------------------------------
mkdir C:\projects
mkdir C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%

rem --------------------------------------------------------------------
rem Step 2: Build PHP
rem --------------------------------------------------------------------
cd C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%
git clone https://github.com/Microsoft/php-sdk-binary-tools.git php-sdk
cd C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%\php-sdk
set VS_VERSION=%VSCMD_VER:~0,2%
phpsdk-vc%VS_VERSION%-%VSCMD_ARG_TGT_ARCH%.bat
phpsdk_buildtree phpmaster
git clone https://github.com/php/php-src.git
cd php-src
phpsdk_deps --update --branch master
buildconf
configure --enable-snapshot-build
nmake snap

rem --------------------------------------------------------------------
rem Step 3: Get GISInternals SDK
rem --------------------------------------------------------------------
cd C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%
mkdir packages
mkdir packages\gisinternals%VSCMD_ARG_TGT_ARCH%\
mkdir gisinternals%VSCMD_ARG_TGT_ARCH%
set GISInternalsArchitecture=-
if %VSCMD_ARG_TGT_ARCH% == x64 set GISInternalsArchitecture=-%VSCMD_ARG_TGT_ARCH%-
wget -O packages\gisinternals%VSCMD_ARG_TGT_ARCH%\release-1911%GISInternalsArchitecture%dev.zip http://download.gisinternals.com/sdk/downloads/release-1911%GISInternalsArchitecture%dev.zip
unzip -q -o packages\gisinternals%VSCMD_ARG_TGT_ARCH%\release-1911%GISInternalsArchitecture%dev.zip -d gisinternals%VSCMD_ARG_TGT_ARCH%

rem --------------------------------------------------------------------
rem Step 4: Other Dependencies
rem --------------------------------------------------------------------
rem ### SWIG ###
cd C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%
git clone https://github.com/AlexanderGabriel/swig
mkdir swig\build
cd swig\build
cmake .. -G "NMake Makefiles"  -DCMAKE_BUILD_TYPE=Release
cmake --build .
move swig.exe ..
rem ### gnulib ###
cd C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%
git clone git://git.savannah.gnu.org/gnulib.git

--------------------------------------------------------------------
Step 5: Build Mapserver with php_mapscriptng
--------------------------------------------------------------------
cd C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%
git clone https://github.com/mapserver/mapserver
cd mapserver
mkdir build
cd build
cmake .. -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=Release -Wno-dev -DCMAKE_PREFIX_PATH=C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%\gisinternals%VSCMD_ARG_TGT_ARCH%\release-1911-%VSCMD_ARG_TGT_ARCH%;C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%\gnulib\lib;C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%\gnulib\include;C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%\gisinternals%VSCMD_ARG_TGT_ARCH%\release-1911-%VSCMD_ARG_TGT_ARCH%\lib;C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%\gisinternals%VSCMD_ARG_TGT_ARCH%\release-1911-%VSCMD_ARG_TGT_ARCH%\include -DREGEX_DIR=C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%\gisinternals%VSCMD_ARG_TGT_ARCH%\regex-0.12 -DWITH_POSTGIS=0 -DWITH_PROTOBUFC=0 -DWITH_THREAD_SAFETY=1 -DWITH_PHPNG=1 -DSWIG_EXECUTABLE=C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%\swig\swig.exe -DSWIG_DIR=C:\projects\mapserver%VSCMD_ARG_TGT_ARCH%\swig
cmake --build .