Get-ADUserNestedGroups.ps1

param
  (
    [string]$StrUser
  )


#Get all recursive groups a user belongs.
Function Get-ADUserNestedGroups
{
    Param
    (
        [string]$DistinguishedName,
        [array]$Groups = @()
    )

    #Get the AD object, and get group membership.
    $ADObject = Get-ADObject -Filter "DistinguishedName -eq '$DistinguishedName'" -Properties memberOf, DistinguishedName;

    #If object exists.
    If($ADObject)
    {
        #Enummurate through each of the groups.
        Foreach($GroupDistinguishedName in $ADObject.memberOf)
        {
            #Get member of groups from the enummerated group.
            $CurrentGroup = Get-ADObject -Filter "DistinguishedName -eq '$GroupDistinguishedName'" -Properties memberOf, DistinguishedName;

            #Check if the group is already in the array.
            If(($Groups | Where-Object {$_.DistinguishedName -eq $GroupDistinguishedName}).Count -eq 0)
            {
                #Add group to array.
                $Groups +=  $CurrentGroup;

                #Get recursive groups.
                $Groups = Get-ADUserNestedGroups -DistinguishedName $GroupDistinguishedName -Groups $Groups;
            }
        }
    }

    #Return groups.
    Return $Groups;
}


#Get all groups.
$Groups = Get-ADUserNestedGroups -DistinguishedName (Get-ADUser -Identity $StrUser).DistinguishedName;

#Output all groups.
$Groups | Select-Object Name | Sort-Object -Property Name;