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<?php $results = []; $results[] = ['topic' => 'Command Line']; $results[] = ['topic' => 'Symfony General']; $results[] = ['topic' => 'Dependency Injection']; $results[] = ['topic' => 'Validation']; $results[] = ['topic' => 'Cache']; $results[] = ['topic' => 'Form']; $results[] = ['topic' => 'Doctrine']; var_dump(array_column($results));