Refactor PHP nightly setup in Windows

src/scripts/win32.ps1

@@ -200,6 +200,16 @@ Function Set-PhpCache {
   } catch { }
 }
 
+# Function to install nightly version of PHP
+Function Install-PhpNightly {
+  Invoke-WebRequest -UseBasicParsing -Uri $php_builder/releases/latest/download/Get-PhpNightly.ps1 -OutFile $php_dir\Get-PhpNightly.ps1 > $null 2>&1
+  & $php_dir\Get-PhpNightly.ps1 -Architecture $arch -ThreadSafe $ts -Path $php_dir -Version $version > $null 2>&1
+  if(Test-Path $php_dir\COMMIT) {
+    return " ($( Get-Content $php_dir\COMMIT ))"
+  }
+  return;
+}
+
 # Variables
 $tick = ([char]8730)
 $cross = ([char]10007)
@@ -280,11 +290,7 @@ if ($null -eq $installed -or -not("$($installed.Version).".StartsWith(($version
   }
   try {
     if ($version -match $nightly_versions) {
-      Invoke-WebRequest -UseBasicParsing -Uri $php_builder/releases/latest/download/Get-PhpNightly.ps1 -OutFile $php_dir\Get-PhpNightly.ps1 > $null 2>&1
-      & $php_dir\Get-PhpNightly.ps1 -Architecture $arch -ThreadSafe $ts -Path $php_dir -Version $version > $null 2>&1
-      if(Test-Path $php_dir\COMMIT) {
-        $extra_version = " ($( Get-Content $php_dir\COMMIT ))"
-      }
+      $extra_version = Install-PhpNightly
     } else {
       Set-PhpCache
       Install-Php -Version $version -Architecture $arch -ThreadSafe $ts -InstallVC -Path $php_dir -TimeZone UTC -InitialPhpIni production -Force > $null 2>&1