Get entire SharePoint farm webs inventory

function Get-DocInventory() {

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

    $farm = [Microsoft.SharePoint.Administration.SPFarm]::Local

    foreach ($spService in $farm.Services) {

        if (!($spService -is [Microsoft.SharePoint.Administration.SPWebService])) {

            continue;

        }

        foreach ($webApp in $spService.WebApplications) {

            if ($webApp -is [Microsoft.SharePoint.Administration.SPAdministrationWebApplication]) { continue }

            foreach ($site in $webApp.Sites) {

                foreach ($web in $site.AllWebs) {

                    foreach ($list in $web.Lists) {

                            $data = @{

                                "Web Application" = $webApp.ToString()

                                "Site" = $site.Url

                                "Web" = $web.Url

                                "list" = $list.Title

                                "Item Count" = $list.ItemCount

                        

                            }

                            New-Object PSObject -Property $data

                                                                                               

                       

                    }

                    $web.Dispose();

                }

                $site.Dispose()

            }

        }

    }

}

#Get-DocInventory | Out-GridView

Get-DocInventory | Export-Csv -NoTypeInformation -Path c:\SP_Inventory.csv