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php - dynamic foreach into variable array

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i want to ask you how to dynamic value $v['answer_1'] in foreach php i give you example my code how can i dynamic answer

 foreach($isi as $key=>$v){
        $tulis[] = array(
            $v['data1']
        ,$v['data2']
        ,$v['data3']
        ,$v['answer_1']
        ,$v['answer_2']
        ,$v['answer_3']
        ,$v['answer_4']
        ,$v['answer_5'] );

how can variable $v['answer'] can dynamic variable can $v['answer_6'],$v['answer_7'] etc no hardcode like this, i hope this clear

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