Php For循环问题将第三个数据视为未定义数据

控制器

for ($x = 1; $x <= $numb; $x++) 
{
    echo $quanoutput = $this->input->post('quanoutput');
    $barcodeoutput = $this->input->post('barcodeoutput');
    $productsoutput = $this->input->post('productsoutput');
    $outward_date=$this->input->post('outward_date');
    $stock=$this->input->post('stock');
    $warehouse_id =$this->input->post('warehouse_id');
    $request_id =$this->input->post('request_id');
    $warehouse=$this->input->post('warehouse');
    $buyprice = $this->input->post('buyprice');
    if ($productsoutput=='undefined'){  
    //$flag3 =   $this->cartmodel->cartInsert($barcodeoutput,$quanoutput,$buyprice,$stock,$warehouse,$warehouse_id,$request_id,$outward_date);
    } else {
        $flag3 = $this->cartmodel->cartInsert($barcodeoutput,$quanoutput,$buyprice,$stock,$warehouse,$warehouse_id,$request_id,$outward_date);
    }
}

for（$x=1；$x输入->发布（$x输出”）；
$barcodeoutput=$this->input->post（'barcodeoutput'）；
$productsoutput=$this->input->post（'productsoutput'）；
$outlower\u date=$this->input->post（'outlower\u date'）；
$stock=$this->input->post（'stock'）；
$warehouse\u id=$this->input->post（'warehouse\u id'）；
$request\u id=$this->input->post（'request\u id'）；
$warehouse=$this->input->post（'warehouse'）；
$buyprice=$this->input->post（'buyprice'）；
如果（$productsoutput=='undefined'）{
//$flag3=$this->cartmodel->cartInsert（$barcodeoutput、$quanoutput、$buyprice、$stock、$warehouse、$warehouse\u id、$request\u id、$Outlook\u date）；
}否则{
$flag3=$this->cartmodel->cartInsert（$barcodeoutput、$quanoutput、$buyprice、$stock、$warehouse、$warehouse\u id、$request\u id、$Outlook\u date）；
}
}

尝试在0处启动for循环（即

j=0

）并更改