Update Validate-PHP.ps1

Add validation for composer install

images/win/scripts/Installers/Validate-PHP.ps1

@@ -33,6 +33,32 @@ else
     exit 1
 }
 
+# Verify that composer.exe is on the path
+if(Get-Command -Name 'composer')
+{
+    Write-Host "$(composer --version) is on the path."
+}
+else
+{
+    Write-Host "composer is not on the path."
+    exit 1
+}
+
+# Get the composer version.
+$composerVersion = $(composer --version)
+
+# Add composer version details in Markdown
+$SoftwareName = "Composer"
+$Description = @"
+#### $composerVersion
+
+_Environment:_
+* PATH: contains the location of composer.exe version $composerVersion
+* PHPROOT: root directory of the Composer $composerVersion installation
+"@
+
+Add-SoftwareDetailsToMarkdown -SoftwareName $SoftwareName -DescriptionMarkdown $Description
+
 # Get available versions of PHP
 $phpVersionOnPath = Get-PHPVersion -phpRootPath "C:\tools\php72"