Get SharePoint site users and Groups, users in group in site collection

[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint")

#Using Get-SPSite
function global:Get-SPSite($url)
 {
    return new-Object Microsoft.SharePoint.SPSite($url)
 }

function global:Get-SPWeb($url)
{
  $site= New-Object Microsoft.SharePoint.SPSite($url)
        if($site -ne $null)
            {
               $web=$site.OpenWeb();     
            }
    return $web
}

$URL="http://***************/"
 
     $site = Get-SPSite $URL
   
     #Write the Header to "Tab Separated Text File"
        "Site Name`t  URL `t Group Name `t User Name`t Type" | out-file "C:\Users\s-US_SC_SSPDev_Admin\Documents\VenuPscripts\CSVFiles\test5.csv"
       
     #Iterate through all Webs
      foreach ($web in $site.AllWebs)
      {
        #Write-Host "Site: ":$web -ForegroundColor Red;
        #Write the Header to "Tab Separated Text File"
        "$($web.title) `t $($web.URL) `t  `t  `t `t `t `t " | out-file "C:\Users\s-US_SC_SSPDev_Admin\Documents\VenuPscripts\CSVFiles\test5.csv" -append
       
         $siteUsers = $web.SiteUsers
         $siteUsers.Count

            foreach($WebRoleAssignment in $Web.RoleAssignments )
        {
          $UserGroupName=$WebRoleAssignment.Member.Name
         

          if($WebRoleAssignment.Member.GetType() -eq [Microsoft.SharePoint.SPGroup])
            {
                 $Type="Group"
                 $UserName=$WebRoleAssignment.Member.Name
               
                 #Set Flag value for "Group Exists"
             $GroupExistsFlag=$true
            }

             else
            {
            #$Typeis = $WebRoleAssignment.Member.GetType()
            $DirectUser = "User"
         
            $UserName=$WebRoleAssignment.Member.Name

                "`t  `t  `t  $($UserName) `t $($DirectUser)" | out-file "C:\Users\s-US_SC_SSPDev_Admin\Documents\VenuPscripts\CSVFiles\test5.csv" -append

                 #Is it a Domain Group?
                 if($WebRoleAssignment.Member.IsDomainGroup)
                 {
                   $Type="Domain Group"
                 }
                 else #if($WebRoleAssignment.Member.LoginName) 
                 {
                   $Type="User"
                 }
            }

        }             
                   
       

#Get all Groups and Iterate through 
foreach ($group in $Web.groups)
{     
#Write-Host "Groups: ":$group -ForegroundColor green;
                              $GroupNameis ="Group"
"`t  `t $($Group.Name) `t   `t $($GroupNameis)" | out-file "C:\Users\s-US_SC_SSPDev_Admin\Documents\VenuPscripts\CSVFiles\test5.csv" -append
#Iterate through Each User in the group
   foreach ($user in $group.users)
{
                                $Usernameis ="User in Group"
    "`t  `t  `t  $($user.name)`t $($Usernameis)" | out-file "C:\Users\s-US_SC_SSPDev_Admin\Documents\VenuPscripts\CSVFiles\test5.csv" -append
    #Write-Host "Groups: ":$user -ForegroundColor white;
    #Exclude Built-in User Accounts
        #if(($User.LoginName.ToLower() -ne "nt authority\authenticated users") -and ($User.LoginName.ToLower() -ne "sharepoint\system") -and ($User.LoginName.ToLower() -ne "nt authority\local service"))
        #{
                             
            #}
}
}
   

       }

    #write-host "Report Generated at C:\Users\s-US_SC_SSPDev_Admin\Documents\VenuPscripts\CSVFiles\test5.csv"