PS: SP - restore all backups from a dir

$waUrl = "http://contoso/"
$backupDir = "E:\temp\20160126"
$dbNamePrefix = "WSS_Content"


$files = Get-Item "$($backupDir)\*.bak"

foreach($file in $files){

    $path = $file.FullName
    $name = $file.Name

    $nodt = $name.Substring(12)
    $pos = $nodt.LastIndexOf('.')
    $noExt = $nodt.Substring(0, $pos)
    $srUrl = $noExt.Replace("_","/")


    $siteUrl = $waUrl.TrimEnd("/") + $srUrl

    $s = get-spsite -Identity $siteUrl -ErrorAction SilentlyContinue

    if($s -ne $null){
        remove-spsite -Identity $siteUrl -Verbose -Confirm:$false
    }



    $dbName = $dbNamePrefix + $noExt



    $dbExists = Get-SPContentDatabase -Identity $dbName -ErrorAction SilentlyContinue
    if($dbExists -ne $null){
        Remove-SPContentDatabase -Identity $dbName -Force -Verbose -Confirm:$false
    }

    New-SPContentDatabase -Name $dbName -WebApplication $waUrl -Verbose -Confirm:$false

    Restore-SPSite -Identity $siteUrl -ContentDatabase $dbName -Path $path -Verbose -Confirm:$false
}