AdsiSearcher.ps1

$dirSearcher = New-Object DirectoryServices.DirectorySearcher
$dirSearcher.PageSize = 1000
$dirSearcher.SizeLimit = 100000
$dirSearcher.Filter = "(samaccountname=$username)"
$dirSearcherResult = $dirSearcher.FindAll()
$results = $dirSearcherResult | ForEach-Object {$_.Properties.title}

# Quick-and-dirty function to search by first name and last name. Should update with parameters and help text instead of Read-Host...
function Get-EmployeeID {
    $givenname = Read-Host -prompt "Enter first name"
    $surname = Read-Host -prompt "Enter last name"
    $dirSearcher = New-Object DirectoryServices.DirectorySearcher
    $dirSearcher.PageSize = 1000
    $dirSearcher.SizeLimit = 100000
    $dirSearcher.Filter = "(&(givenname=$givenname)(sn=$surname))"
    $dirSearcherResult = $dirSearcher.FindAll()
    $dirSearcherResult | ForEach-Object {
        [pscustomobject]@{
            DisplayName = [string]$_.Properties.displayname
            EmployeeID = [string]$_.Properties.employeeid
            Properties = [string]$_.Properties.title
        }
    }
}
Get-EmployeeID