PHP：使用标签名称获取元素的索引 [英] PHP: Get index of element with Tag Name

问题描述

我试图获得一个HTML元素的索引，并将其传递给一个PHP变量，最终上传到数据库中。

 < form method =postaction =insert.phpenctype =multipart / form-data> 
 .... 
< div>< textarea name =paragraph []>< / textarea>< / div> // index 0 
< div>< textarea name =paragraph []>< / textarea>< / div> // index 1 
< div>< textarea name =paragraph []>< / textarea>< / div> // index 2 
 .... 
< / form> 
 
 if（isset（$ _ POST ['paragraph']））{
 
 foreach（$ _POST ['paragraph'] as $ paragraph）{
 
 //获取本段的容器div的索引并将其存储在一个变量中
 
 
 $ b code> 

查看堆栈溢出答案，我猜我应该做点什么如：



  $ divs = $ dom-> getElementsByTagName（'div'）; 
  

然而，并非所有< div> 元素并将它们存储在一个数组中，有没有什么办法可以从 foreach 中获取当前的< div> 循环并将其索引存储在变量中？





一些说明：表单是动态的。所以它也可能看起来像这样：

 < form> 
< div>< textarea name =paragraph []>< / textarea>< / div> // index 0 
< div>< textarea name =something_else>< / textarea>< / div> index 1 
< div>< textarea name =paragraph []>< / textarea>< / div> // index 2 
< div>< textarea name =paragraph []>< / textarea>< / div> // index 3 
< / form> 
  

解决方案

您可以使用基本数组来保存所有项目如下面的HTML：

 < div>< textarea name =items [] [paragraph]><<< ; / textarea的>< / DIV> // index 0 
< div>< textarea name =items [] [something_else]>< / textarea>< / div> index 1 
< div>< textarea name =items [] [paragraph]>< / textarea>< / div> // index 2 
< div>< textarea name =items [] [paragraph]>< / textarea>< / div> // index 3 
  

然后当您访问 $ _ POST ['items']

$ p $ array（size = 1）
'items'=>
array（size = 4）
0 =>
array（size = 1）
'paragraph'=>字符串'test'（长度= 4）
1 =>
array（size = 1）
'something_else'=>字符串'test 2'（长度= 6）
2 =>
array（size = 1）
'paragraph'=>字符串'test 3'（长度= 6）
3 =>
array（size = 1）
'paragraph'=>字符串'test 4'（长度= 6）


您可以轻松获得该数组中所有的信息使用下面的循环：

  foreach（$ _ POST ['items'] as $ index => $ item）{
 echo索引是：。 $指数; 
回显密钥是：。键（$项目）; 
 echoValue is：。 $项目[键（$项目）]; 
} 
  

这将打印：

 索引是：0 
键是：段落
值是：test 
 
索引是：1 
键是：something_else 
值为：test 2 
 
等
  

如果你想一次轻松地得到段落的所有值，你可以使用

  array_column （$ _POST ['items']，'paragraph'）; 
  

将会列印：

  array（size = 3）
 0 =>字符串'test'（长度= 4）
 1 =>字符串'test 3'（长度= 6）
 2 =>字符串'test 4'（长度= 6）
  

I'm trying to get the index of an HTML element and pass this to a PHP variable to eventually upload to a database.

<form method="post" action="insert.php" enctype="multipart/form-data">
    ....
    <div><textarea name="paragraph[]"></textarea></div> //index 0
    <div><textarea name="paragraph[]"></textarea></div> //index 1
    <div><textarea name="paragraph[]"></textarea></div> //index 2
    ....
</form>

if(isset($_POST['paragraph'])) {

    foreach ( $_POST['paragraph'] as $paragraph){

    //get index of container div for this paragraph and store it in a variable

    }
}

Looking at this Stack Overflow answer, I'm guessing I should do something like:

$divs = $dom->getElementsByTagName('div');

However, instead of getting all the <div> elements and storing them in an array, is there any way I can get the current <div> element from within the foreach loop and store its index in a variable?

Some clarification: The form is dynamic. So it could look like this, too:

<form>
    <div><textarea name="paragraph[]"></textarea></div> //index 0
    <div><textarea name="something_else"></textarea></div> index 1
    <div><textarea name="paragraph[]"></textarea></div> //index 2
    <div><textarea name="paragraph[]"></textarea></div> //index 3
</form>

解决方案

You could use a base array to hold all your items such as the below HTML:

<div><textarea name="items[][paragraph]"></textarea></div> //index 0
<div><textarea name="items[][something_else]"></textarea></div> index 1
<div><textarea name="items[][paragraph]"></textarea></div> //index 2
<div><textarea name="items[][paragraph]"></textarea></div> //index 3

Then when you access $_POST['items'] you will have them listed with their indexes:

array (size=1)
  'items' => 
    array (size=4)
      0 => 
        array (size=1)
          'paragraph' => string 'test' (length=4)
      1 => 
        array (size=1)
          'something_else' => string 'test 2' (length=6)
      2 => 
        array (size=1)
          'paragraph' => string 'test 3' (length=6)
      3 => 
        array (size=1)
          'paragraph' => string 'test 4' (length=6)

You can get all the information held in this array easily using the below loop:

foreach($_POST['items'] as $index => $item) {
  echo "Index is: " . $index;
  echo "Key is: " . key($item);
  echo "Value is: " . $item[key($item)];
}

Which will print:

Index is: 0
Key is: paragraph
Value is: test

Index is: 1
Key is: something_else
Value is: test 2

etc.

If you want to get all values for paragraph in one easy swoop you can use array_column to access these, for example the below:

array_column($_POST['items'], 'paragraph');

Will print:

array (size=3)
  0 => string 'test' (length=4)
  1 => string 'test 3' (length=6)
  2 => string 'test 4' (length=6)

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