Laravel migration drop index if exists

AppServiceProvider.php

<?php
// app/Providers/AppServiceProvider.php

use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

public function boot() 
{
    Blueprint::macro('dropIndexIfExists', function ($index) {
        /** @var Blueprint $this */

        $schema = Schema::getConnection()->getDoctrineSchemaManager();
        $tableDetails = $schema->listTableDetails($this->getTable());

        if ($tableDetails->hasIndex($index)) {
            $this->dropIndex($index);
        }
    });
}

//  Migration usage

$table->dropIndexIfExists('indexname');