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用javascript(codeigniter)动态表单将PHP导入数据库

我想使用数组插入多个数据(PHP CodeIgniter).但我仍然发现错误.错误是数组不清楚

function insert(){

    $hitung=count($_POST['pembicara']);

    $pengisi=implode(',',$_POST['pembicara']);
    $materi=implode(',',$_POST['materi']);
    $alasan=implode(',',$_POST['alasan']);

    $datapembicara = array(
    'id_kegiatan'   => $x,
    'nama_pembicara'   => $pengisi,                                         
    'materi'      => $materi,                                           
    'alasan'      => $alasan,
    );

    $this->m_admin_smf->add_pembicara($datapembicara);
}
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当我var_dump显示结果时

array (size=4)
  'id_kegiatan' => int 990550
  'nama_pembicara' => string '1,2' (length=9)
  'materi' => string '1,2' (length=3)
  'alasan' => string '1,2' (length=3)

array (size=4)
  'id_kegiatan' => int 990550
  'nama_pembicara' => string '1,2' (length=9)
  'materi' => string '1,2' (length=3)
  'alasan' => string '1,2' (length=3)
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结果应该是这样的

array (size=4)
  'id_kegiatan' => int 990550
  'nama_pembicara' => string '1' …
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javascript php arrays codeigniter

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