Question

这是我的问题：我从数据库中获取了STOCK的值并在文本框中输入了一个值，问题是当我尝试计算系统时无法识别或说未定义的索引：库存

这是从值到计算的语法：

<td><input type = "text" name = "stock[]"  size = "5" value = '<?php echo $row['stock'];  ?>' disabled></td>
<td><input type = 'text' name = 'stockin[]' size = '5'></td>
<td><input type  ="submit" name = "btn" value = "re-stock"></td>

这是我放在标签

之后的计算语法

<?php
$capture_field_vals1="";
if(isset($_POST['btn']))
{
    foreach($_POST['stockin'] as $key => $text_field){
        $capture_field_vals1 .= $text_field;
    }
    echo $capture_field_vals1;

$num1 = $_POST['stock[]'];
$num2 = $_POST['$capture_field_vals1'];
$num3 = $num1 + $num2;
echo $num3;
}
?>

Answer 1

“[]”表示数组，此时您可能需要向数据库写入多个数据。同样在PHP脚本中，您可以通过var_dump($_POST);

观察传入的帖子

<?php
if( isset($_POST["stock"]) ){
    foreach ($_POST["stock"] as $key => $value) {
        echo $value."<BR>";
    }
}
?>

<form method="post" action="?">
<input type = "text" name = "stock[]"  size = "5" value = '1'/>
<input type = "text" name = "stock[]"  size = "5" value = '2'/>
<input type="submit">
</form>

如何在数据库中汇总数据库和输入值的值

1 个答案: