SharePoint PowerShell : Remove Missing Features From Content Database

You might have came across an error message reported similar to this one: [MissingFeature] Database [SharePoint_Content_Portal] has reference(s) to a missing feature: Id = [xxxxxxxx-xxxxxxxx--xxxxxxxx-xxxxxxx], Name = [My Feature], Description = [], Install Location = [Test-MyFeature]. The feature with Id xxx-xxxxxx-xxxxxx-xxxxx is referenced in the database [SharePoint_Content_Portal], but is not installed on the current farm. The missing feature may cause upgrade to fail. Please install any solution which contains the feature and restart upgrade if necessary.

function Remove-SPFeatureFromContentDB($ContentDb, $FeatureId, [switch]$ReportOnly)
{
    $db = Get-SPDatabase | where { $_.Name -eq $ContentDb }
    [bool]$report = $false
    if ($ReportOnly) { $report = $true }

    $db.Sites | ForEach-Object {

        Remove-SPFeature -obj $_ -objName "site collection" -featId $FeatureId -report $report

        $_ | Get-SPWeb -Limit all | ForEach-Object {

            Remove-SPFeature -obj $_ -objName "site" -featId $FeatureId -report $report
        }
    }
}

function Remove-SPFeature($obj, $objName, $featId, [bool]$report)
{
    $feature = $obj.Features[$featId]

    if ($feature -ne $null) {
        if ($report) {
            write-host "Feature found in" $objName ":" $obj.Url -foregroundcolor Red
        }
        else
        {
            try {
                $obj.Features.Remove($feature.DefinitionId, $true)
                write-host "Feature successfully removed from" $objName ":" $obj.Url -foregroundcolor Red
            }
            catch {
                write-host "There has been an error trying to remove the feature:" $_
            }
        }
    }
    else {
        write-host "Feature ID specified does not exist in" $objName ":" $obj.Url
    }
}

$contentDatabaseName = Read-Host "Enter the Content Datbase name:"
$featureId = Read-Host "Enter the feature Id :"

Remove-SPFeatureFromContentDB -ContentDB $contentDatabaseName -FeatureId $featureId –ReportOnly