如何循环遍历表单中的输入数组? [英] How to loop through an array of inputs in a form?

问题描述

我正在尝试查看表单中的一些输入字段并将它们添加到数据库中.用户设置了字段数，所以我不能像下面的代码那样做，因为没有特定的字段数.

I am trying to look through some input fields in a form and add them to a database. The user sets the number of fields, so I can't do something like the code below because there is no specific number of fields.

for($i=0; $i<(number-of-fields); $i++)
{
    $_REQUEST['Question+$i']
}

我也试过这个:

<?php
$con=mysqli_connect("","test","test","Flashcards");

foreach($_REQUEST['Question[]'] as $value)
    {
    $newcards="INSERT INTO Cards(Questions)
    VALUES($value)";
    mysqli_query($con,$newcards);
    }

mysqli_close($con);
?>

它只是没有向我的数据库添加任何内容.我该怎么做呢?我是 PHP 和 SQL 的新手，似乎无法弄清楚这一点.

It just doesn't add anything to my database. How should I go about doing this? I am new to PHP and SQL and can't seem to figure this out.

推荐答案

鉴于:

<input type="text" name="foo[]" />
<input type="text" name="foo[]" />
etc...

在你的表单中，你可以用

in your form, you'd loop over them with

foreach($_POST['foo'] as $index => $value) {
    ...
}

字段名中的[] 将被PHP剥离并用作提示它应该期望多个具有相同名称的值，从而导致它在$_GET内部创建一个子数组/$_POST 来容纳这些额外的值.

The [] in the field name will be stripped off by PHP and used as a hint that it should expect multiple values with the same name, causing it to create a sub-array inside $_GET/$_POST to accomodate those extra values.

您还可以建议 PHP 应该使用哪些数组键，例如

You can also suggest which array keys PHP should use, e.g.

<input type="text" name="foo[1]" value="hi there" />
<input type="text" name="foo[abc]" value="TGIF!" />

echo $_POST['foo'][1]; // outputs "hi there"
echo $_POST['foo']['abc'] // outputs "TGIF!"

也支持多维数组，使用相同的表示法/访问方法.

Multi-dimensional arrays are also supported, using the same notation/access methods.

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