Export Content Type using PowerShell in SharePoint

Requirement: Export the content type of a web in SharePoint into an XML file so that it can be imported in other environments such as Test, Stage, and Production

Solution: Automate the export process of content type from SharePoint web using PowerShell script.

Script:

clear  
 Remove-PSSnapin Microsoft.SharePoint.Powershell -ErrorAction SilentlyContinue  
 Add-PSSnapin Microsoft.SharePoint.Powershell  
 ####################### ENVIRONMENT VARIABLES #######################  
 $contentTypeSourceWeb = "<<weburl>>" #Ex: http://webapp/sites/myproject  
 # This is the place where exported content type is stored the XML file  
 $xmlFilePathForContentType = "C:\Script-SiteContentTypes.xml"  
 #####################################################################  
 #Content Type group you are looking to export  
 $contentTypeGroupName = "Custom Content Types"  
 $sourceWeb = Get-SPWeb $contentTypeSourceWeb  
 #Create Export File  
 New-Item $xmlFilePathForContentType -type file -force  
 #Export Content Types to XML file  
 Add-Content $xmlFilePathForContentType "<?xml version=`"1.0`" encoding=`"utf-8`"?>"  
 Add-Content $xmlFilePathForContentType "`n<ContentTypes>"  
 $sourceWeb.ContentTypes | ForEach-Object {  
   if ($_.Group -eq $contentTypeGroupName) {  
     write-host "Adding content type to file."  
     Add-Content $xmlFilePathForContentType $_.SchemaXml  
   }  
 }  
 Add-Content $xmlFilePathForContentType "</ContentTypes>"  
 $sourceWeb.Dispose()  
 write-host "Completed"