param( 
    [string]$url
)

if (-not $url)
{
    Write-Host "Specify site collection url in url parameter" -foregroundcolor red
    return
}

Get-SPUser -Web $url -Limit All | sort-object UserLogin | select UserLogin, @{name=”Exlicit given roles”;expression={$_.Roles}}, @{name=”Roles given via groups”;expression={$_.Groups | %{$_.Roles}}},Groups | format-Table -auto