Cycle SQL Server Error Logs based on size using PowerShell

<#.SYNOPSIS
Manage SQL Error Log Size.
.DESCRIPTION
The Optimize-SQLErrorlog function will display the error log size of the given sq. instances,
and will recycle the sq. server instances' current error log based on an input threshold
It can also turn on TF 3226 to suppress backup successful info in the error log

.INPUTS
$ServerInstance: single or multiple sq. server instances where we will check and optimize the sq. error log size
$Threshold: integer number for MB, default 10
$DisableBackupInfo: switch, if present, will turn TF 3226 on if TF3226 not there
$Optimize: switch, if present, will recycle error log when current log size bigger than $Threshold MB

.OUTPUTS
Current SQL error log size info

.EXAMPLE
Optimize-SQLErrorLog -ServerInstance "jy\sql2k8", "jy\sql2012" 

This command is to check the sq. error log size on two sq. instances jy\sql2k8 and jy\sql2012

.EXAMPLE
Optimize-SQLErrorLog -ServerInstance "jy\sql2k8", "jy\sql2012" -threshold 1 -optimize
This command will 

#>
#You may need to run the following line to ensure that PowerShell can use the SQL Server SMO object
#assuming you have sq. server 2012 or sq. server 2008 (or R2) installed    
try {add-type -AssemblyName "Microsoft.SqlServer.Smo, Version=11.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" -EA Stop;}
catch {add-type -AssemblyName "Microsoft.SqlServer.Smo, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91"; }

Function Optimize-SQLErrorLog {
[CmdletBinding()] 

Param (
    [Parameter(Mandatory=$false, ValueFromPipeline=$true)] [string[]]$ServerInstance=$env:COMPUTERNAME,
    [ValidateRange(1, 999999)] [int]$Threshold=10, #MB, default to 10 MB
    [switch] $DisableBackupInfo,
    [switch] $Optimize
)

foreach ($svr in $ServerInstance) {
    try {
        $s = new-object Microsoft.SqlServer.Management.SMO.Server($svr);

        if ($s.version -eq $null) #means $svr may be a typo
        { $len = -1.00; }
        else {
            [string]$logpath = $s.ErrorLogPath;
      
            # if $svr is a named instance, we need to get the machinename
            [string]$mach = ($svr.split('\'))[0];
            if ($mach -ne $env:COMPUTERNAME)
            {
                $logpath = $logpath.Replace(':', '$');
                $logpath = "\\$mach\$logpath\ErrorLog";
            }
            else
            {
                $logpath = "$logpath\ErrorLog";
            }
                
            $itm = get-item $logpath;
        
            [decimal]$len = $itm.Length/1mb;
            if ($Optimize) {
                if ($len -ge $Threshold)
                {
                    ($s.Databases['master']).ExecuteNonQuery('exec sp_cycle_errorlog');
                    Write-Verbose -Message "sp_cycle_errorlog: $svr";
                }
            } #$Optimize
        
            if ($DisableBackupInfo) {
                ($s.Databases['master']).ExecuteNonQuery('dbcc traceon(3226,-1)');
                Write-Verbose -Message "Turn on TF3226: $svr";
            }# $DisableBackupInfo
        }#else;
        $SelectSplat = @{Property=('ServerInstance','LogSizeMB') };
        new-object -TypeName PSObject -Property @{
        ServerInstance = $svr
        LogSizeMB = "{0:N2}" -f ($len) } |
        Select-Object @SelectSplat;
        
    }#try
    catch
    {
        write-error -message $error[0].Exception.Message;
    }#catch
  } #foreach ($svr in $ServerInstance)
}#Optimize-SQLErrorLog