我无法在php中获得多个选择框的选择值。

Question

所以，我有一个HTMLPHP表单，它有一个选择列表框，你可以从这个列表框中选择多个值，因为它的多个属性被设置为多个。考虑表单方法是'POST'。但是当我点击SUBMIT时，列表框只保存了一个值（具体到最后选择的值）。我不知道为什么。

这是我代码的一部分。

    <?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>

Answer 1

代码工作对我来说是正确的。

/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？

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>

编辑。

当你在PHP中接收数组数据时，在你的情况下。

<select name="classes[]" >

PHP的变量是 $_POST['classes'] 不 $_POST['classes[]'] 而且它是一个数组，如果你想把它作为一个字符串使用，你必须使用 内爆