Illuminate\Database\Connection::isDoctrineAvailable PHP Метод

    public function isDoctrineAvailable()
    {
        return class_exists('Doctrine\\DBAL\\Connection');
    }

 /**
  * Compile a change column command into a series of SQL statements.
  *
  * @param  \Illuminate\Database\Schema\Blueprint  $blueprint
  * @param  \Illuminate\Support\Fluent  $command
  * @param  \Illuminate\Database\Connection $connection
  * @return array
  */
 public function compileChange(Blueprint $blueprint, Fluent $command, Connection $connection)
 {
     if (!$connection->isDoctrineAvailable()) {
         throw new RuntimeException(sprintf('Changing columns for table "%s" requires Doctrine DBAL; install "doctrine/dbal".', $blueprint->getTable()));
     }
     $schema = $connection->getDoctrineSchemaManager();
     $tableDiff = $this->getChangedDiff($blueprint, $schema);
     if ($tableDiff !== false) {
         return (array) $schema->getDatabasePlatform()->getAlterTableSQL($tableDiff);
     }
     return [];
 }