Add PHP sample (#78)

* Added PHP dockerfile.

* Refactored dockerfile to use multistage build. Reduced layer count from 22 to 8.

* Move to samples folder. Update readme

samples/php/Dockerfile

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+# escape=`
+
+#
+# This Dockerfile is provided for demonstration purposes only and it is not supported by Microsoft
+# PHP 7.1 x64 running on IIS
+#
+
+FROM microsoft/iis AS php71
+
+SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop';"]
+
+RUN `
+    try { `
+        # Install PHP `
+        Invoke-WebRequest 'https://sourceforge.net/projects/phpinstallermsi/files/zip/php-7.1.7-nts-Win32-VC14-x64.zip/download' -UserAgent '' -OutFile C:\php.zip; `
+        Invoke-WebRequest 'https://download.microsoft.com/download/6/A/A/6AA4EDFF-645B-48C5-81CC-ED5963AEAD48/vc_redist.x64.exe' -UserAgent '' -OutFile C:\vc_redist-x64.exe; `
+        Invoke-WebRequest 'https://sourceforge.net/projects/wincache/files/wincache-2.0.0/wincachewpi-2.0.0.8-7.1-nts-vc14-x64.exe/download' -UserAgent '' -OutFile C:\php_wincache.exe; `
+        Expand-Archive -Path c:\php.zip -DestinationPath C:\PHP; `
+        `
+        # Install PHP Win Cache `
+        C:\php_wincache.exe /Q /C "/T:C:\php_wincache_msi"; `
+        Start-Process -FilePath msiexec -ArgumentList '/a C:\php_wincache_msi\wincache71x64wpi.msi /qb TARGETDIR=C:\php_wincache_msi\extracted' -NoNewWindow -PassThru -Wait; `
+        Copy-Item C:\php_wincache_msi\extracted\PFiles\php_wincache.dll c:\PHP\ext; `
+        `
+        # Configure PHP `
+        Copy-Item C:\PHP\php.ini-production C:\PHP\php.ini; `
+    } `
+    catch { `
+        $_.Exception; `
+        $_; `
+        exit 1; `
+    }
+
+FROM microsoft/iis
+ 
+COPY --from=php71 ["/php/", "/php/"]
+COPY --from=php71 ["/vc_redist-x64.exe", "/vc_redist-x64.exe"]
+
+#
+# Enable required IIS Features
+# Install VC Redist 14
+# Configure IIS
+# Configure system PATH
+#
+RUN dism.exe /Online /Enable-Feature /FeatureName:IIS-CGI /All && `
+    C:\vc_redist-x64.exe /quiet /install && `
+    del C:\vc_redist-x64.exe && `
+    %windir%\system32\inetsrv\appcmd.exe set config /section:system.webServer/fastCgi /+[fullPath='c:\PHP\php-cgi.exe'] && `
+    %windir%\system32\inetsrv\appcmd.exe set config /section:system.webServer/handlers /+[name='PHP_via_FastCGI',path='*.php',verb='*',modules='FastCgiModule',scriptProcessor='c:\PHP\php-cgi.exe',resourceType='Either'] && `
+    %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/fastCgi /[fullPath='c:\PHP\php-cgi.exe'].instanceMaxRequests:10000 && `
+    %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/fastCgi /+[fullPath='c:\PHP\php-cgi.exe'].environmentVariables.[name='PHP_FCGI_MAX_REQUESTS',value='10000'] && `
+    %windir%\system32\inetsrv\appcmd.exe set config -section:system.webServer/fastCgi /+[fullPath='c:\PHP\php-cgi.exe'].environmentVariables.[name='PHPRC',value='C:\PHP'] && `
+    %windir%\system32\inetsrv\appcmd.exe set config /section:defaultDocument /enabled:true /+files.[value='index.php'] && `
+    setx PATH /M %PATH%;C:\PHP && `
+    setx PHP /M "C:\PHP" && `
+    del C:\inetpub\wwwroot\* /Q
+
+# Optional: Add a starter page
+# RUN powershell.exe -Command '<?php phpinfo(); ?>' | Out-File C:\inetpub\wwwroot\index.php -Encoding UTF8
+
+#
+#ADD any application content and perform any configuration below

samples/php/README.md

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+# PHP On IIS
+
+## What is PHP
+
+PHP (PHP: Hypertext Processor) is a server side scripting language as well as web framework that can be used to develop applications ranging from simple to complex.
+
+## Getting Started
+
+To add a PHP application into the container, first put the application content into a folder named _content_ and then append the following commands to the dockerfile located within this directory
+
+```Dockerfile
+# PHP dockerfile
+# The content of the docker file will be here
+# Add your content below
+
+WORKDIR /inetpub/wwwroot
+
+COPY ./content .
+``` 
+
+You can then build the image:
+
+```
+docker build -t iis-php .
+docker run -d -p 80:00 --name my-php-site iis-php
+```
+
+## Testing PHP
+
+To test the PHP functionality of the container without the need for a PHP application uncomment the following _RUN_ line within the docker file
+
+```
+# Optional: Add a starter page
+# RUN powershell.exe -Command "'<?php phpinfo(); ?>' | Out-File C:\inetpub\wwwroot\phpinfo.php" -Encoding UTF8
+```
+
+Once the container is running, navigate to http://\<container host name\>/phpinfo.php
+
+The generic php info page should be returned from the container. This verifies that PHP is functioning as expected.