SharePoint: Function to Create Default SharePoint Groups

When you create a site collection via PowerShell for some reason the default SharePoint Groups (members/Visitors/Owners) are not created.

With the following powershell code you create the default groups:

Function fCreateDefaultSharepointGroups($SPUrl)
{
	try
	{
		$web = Get-SPWeb $SPUrl
		$web.CreateDefaultAssociatedGroups("","","")
	}
	catch [Exception]
	{}
}