php 使用 HTML 表单隐藏元素传递数组

Passing an array using an HTML form hidden element

提问by Shrishail

I am trying to post an array in a hidden field and want to retrieve that array after submitting a form in PHP.

我试图在隐藏字段中发布一个数组，并希望在用 PHP 提交表单后检索该数组。

$postvalue = array("a", "b", "c");
<input type="hidden" name="result" value="<?php echo $postvalue; ?>">

But I am getting only an array string after printing the posted value. So how can I solve it?

但是在打印发布的值后我只得到一个数组字符串。那么我该如何解决呢？

回答by Shakti Singh

Use:

用：

$postvalue = array("a", "b", "c");
foreach($postvalue as $value)
{
    echo '<input type="hidden" name="result[]" value="'. $value. '">';
}

And you will get $_POST['result']as an array.

你会得到$_POST['result']一个数组。

print_r($_POST['result']);

回答by s1lence

There are mainly two possible ways to achieve this:

主要有两种可能的方法来实现这一点：

1. Serialize the data in some way:

   $postvalue = serialize($array); // Client side
   
   $array = unserialize($_POST['result']; // Server side
   

1. 以某种方式序列化数据：

   $postvalue = serialize($array); // Client side
   
   $array = unserialize($_POST['result']; // Server side
   

And then you can unserialize the posted values with unserialize($postvalue). Further information on this is here in the PHP manuals.

然后您可以使用unserialize($postvalue). 有关这方面的更多信息，请参见 PHP 手册。

Alternativeley you can use the json_encode()and json_decode()functions to get a JSON formatted serialized string. You could even shrink the transmitted data with gzcompress()(note that this is performance intensive) and secure the transmitted data with base64_encode()(to make your data survive in non-8 bit clean transport layers) This could look like this:

或者，您可以使用json_encode()和json_decode()函数来获取 JSON 格式的序列化字符串。您甚至可以缩小传输的数据gzcompress()（请注意，这是性能密集型的）并保护传输的数据base64_encode()（使您的数据在非 8 位干净的传输层中存活）这可能如下所示：

    $postvalue = base64_encode(json_encode($array)); // Client side

    $array = json_decode(base64_decode($_POST['result'])); // Server side

A not recommended way to serialize your data (but very cheap in performance) is to simply use implode()on your array to get a string with all values separated by some specified character. On the server side you can retrieve the array with explode()then. But note that you shouldn't use a character for separation that occurs in the array values (or then escape it) and that you cannot transmit the array keys with this method.

一种不推荐的序列化数据的方法（但性能非常便宜）是简单地implode()在数组上使用以获取所有值由某个指定字符分隔的字符串。在服务器端，您可以使用explode()then检索数组。但请注意，您不应该使用出现在数组值中的分隔字符（或转义它），并且您不能使用此方法传输数组键。

1. Use the properties of special named input elements:

   $postvalue = "";
   foreach ($array as $v) {
     $postvalue .= '<input type="hidden" name="result[]" value="' .$v. '" />';
   }
   

   Like this you get your entire array in the $_POST['result']variable if the form is sent. Note that this doesn't transmit array keys. However you can achieve this by using result[$key]as name of each field.

2. 使用特殊命名输入元素的属性：

   $postvalue = "";
   foreach ($array as $v) {
     $postvalue .= '<input type="hidden" name="result[]" value="' .$v. '" />';
   }
   

   像这样，$_POST['result']如果发送表单，您将在变量中获得整个数组。请注意，这不会传输数组键。但是，您可以通过使用result[$key]作为每个字段的名称来实现这一点。

Everyone of these methods got their own advantages and disadvantages. What you use is mainly depending on how large your array will be, since you should try to send a minimal amount of data with all of this methods.

这些方法中的每一种都有自己的优点和缺点。您使用什么主要取决于您的阵列有多大，因为您应该尝试使用所有这些方法发送最少量的数据。

Another way to achieve the same is to store the array in a server side session instead of transmitting it client side. Like this you can access the array over the $_SESSIONvariable and don't have to transmit anything over the form. For this have a look at a basic usage example of sessions on php.net.

另一种实现相同目的的方法是将数组存储在服务器端会话中，而不是在客户端传输它。像这样，您可以通过$_SESSION变量访问数组，而不必通过表单传输任何内容。为此，请查看php.net 上会话的基本用法示例。

回答by Kabir Hossain

You can use serialize and base64_encode from the client side. After that, then use unserialize and base64_decode on the server side.

您可以从客户端使用 serialize 和 base64_encode。之后，然后在服务器端使用反序列化和base64_decode。

Like:

喜欢：

On the client side, use:

在客户端，使用：

    $postvalue = array("a", "b", "c");
    $postvalue = base64_encode(serialize($array));

   // Your form hidden input
   <input type="hidden" name="result" value="<?php echo $postvalue; ?>">

On the server side, use:

在服务器端，使用：

    $postvalue = unserialize(base64_decode($_POST['result']));
    print_r($postvalue) // Your desired array data will be printed here

回答by ēriks Daliba

Either serialize:

要么序列化：

$postvalue=array("a","b","c");
<input type="hidden" name="result" value="<?php echo serialize($postvalue); ?>">

on receive: unserialize($_POST['result'])

接收时： unserialize($_POST['result'])

Or implode:

或内爆：

$postvalue=array("a","b","c");
<input type="hidden" name="result" value="<?php echo implode(',', $postvalue); ?>">

On receive: explode(',', $_POST['result'])

接收时： explode(',', $_POST['result'])

回答by Diagboya Ewere

<input type="hidden" name="item[]" value="[anyvalue]">

Let it be in a repeated mode it will post this element in the form as an array and use the

让它处于重复模式，它将将此元素作为数组发布在表单中并使用

print_r($_POST['item'])

To retrieve the item

取回物品

回答by heximal

It's better to encode first to a JSON string and then encode with Base64, for example, on the server side in reverse order: use first the base64_decode and then json_decode functions. So you will restore your PHP array.

最好先编码为 JSON 字符串，然后使用 Base64 编码，例如，在服务器端以相反的顺序：先使用 base64_decode 再使用 json_decode 函数。所以你将恢复你的 PHP 数组。

回答by Nicola Peluchetti

If you want to post an array you must use another notation:

如果要发布数组，则必须使用另一种表示法：

foreach ($postvalue as $value){
<input type="hidden" name="result[]" value="$value.">
}

in this way you have three input fields with the name result[] and when posted $_POST['result']will be an array

通过这种方式，您有三个名称为 result[] 的输入字段，发布时$_POST['result']将是一个数组

回答by genesis

You can do it like this:

你可以这样做：

<input type="hidden" name="result" value="<?php foreach($postvalue as $value) echo $postvalue.","; ?>">