我无法在php中获得选择框的多个选定值 [英] I can't get multiple selected values of select box in php

问题描述

因此，我有一个HTML/PHP表单，该表单具有一个选择列表框，您可以从中选择多个值，因为其多个属性都设置为多个.考虑表单方法是"POST".但是，当我单击提交"时，列表框仅保存一个值(具体来说，最后选择的值).我不知道为什么.

So, I have an HTML/PHP form that has a select list box from which you can select multiple values because its multiple properties are set to multiple. Consider the form method is 'POST'. But the list box is saving only one value when I click on SUBMIT (to be specific the last value chosen). I don't know why.

这是我的代码的一部分:

This is part of my code:

    <?php
    if(isset($_POST['submitSave'])) {
    // Disable errors due to empty xml files
        error_reporting(E_ALL & ~E_WARNING);

        $domDoc = new DOMDocument('1.0', 'UTF-8');
        $domDoc->preserveWhiteSpace = false;
        $domDoc->formatOutput = true;
        $domDoc->encoding = 'UTF-8';
        $domDoc->load('./data/expression.xml');
        $xpath = new DOMXpath($domDoc);


        if($domDoc->getElementsByTagName('expression')->length>0){
            // If we already have expression tag defined
            $expression = $domDoc->getElementsByTagName('expression')[0];
        }else{
            // If we don't have any expression tag, i.e. file is empty
            $expression = $domDoc->createElement('expression');
        }

    $vocabulario = $domDoc->createElement('vocabulario');
    $vocabulario->setAttribute('word', $_POST['word']);
    $classe = $domDoc->createElement('classe', $_POST['classe']);

    $domDoc->appendChild($expression);
    $expression->appendChild($vocabulario);
    $vocabulario->appendChild($classe);

    file_put_contents('./data/expression.xml', $domDoc->saveXML());
    header('location:index.php');

}
?>

<form method="post">
<div class="col-75">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>
  <link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.css" rel="stylesheet" />
  <select name="classe[]" multiple="multiple">
    <option value="| adjective |">adjective</option>
    <option value="| adverb |">adverb</option>
    <option value="| noun |">noun</option>
    <option value="| verb |">verb</option>
  </select>
  <script type="text/javascript">
    var s2 = $("#classe").select2({
      placeholder: "Select",
      tags: true
    });
  </script>
</div>

<div class="row">
  <td><input type="submit" value="Save" name="submitSave"></td>
</div>

推荐答案

代码正好适合我:

/home/vagrant/foo/index.php:3:
array (size=2)
  'classe' => 
    array (size=2)
      0 => string '| adjective |' (length=13)
      1 => string '| adverb |' (length=10)
  'submitSave' => string 'Save' (length=4)

在PHP中有一些特殊的配置吗?

have some special config in PHP?

我的测试:

<?php

var_dump($_POST);

?>
<form method="POST">
     <div class="col-75">
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/js/select2.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.3/css/select2.css" rel="stylesheet"/>
    <select id="classe" name="classe[]" multiple name="event_type[]" class="form-control" required>
  <option value="| adjective |">adjective</option>
  <option value="| adverb |">adverb</option>
  <option value="| noun |">noun</option>
  <option value="| verb |">verb</option>
</select>
<script type="text/javascript">
        var s2 = $("#classe").select2({
    placeholder: "Select",
    tags: true
});


    </script>
</div>
<div class="row">

            <td><input type="submit" value="Save" name="submitSave"></td>
    </div>  
</form>

当您使用PHP接收数组数据时，

when yo receive array data in PHP, in your case:

<select name="classes[]" >

PHP变量是$_POST['classes']而不是$_POST['classes[]']，它是一个数组，如果要使用它作为字符串，则必须使用

the PHP var is $_POST['classes'] not $_POST['classes[]'] and it is an array, if you want to use it as an string you have to use implode

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