CodeIgniter 控制器中多选输入文本字段的值

Question

如何在 CodeIgniter 控制器中获取多选输入字段的值？

I want a multiple select input field shown here

我在下面添加了html代码。

<select class="js-example-basic-multiple  multiple_selection form-control" name="student[]" multiple="multiple"  >
                <option value="1">Student1</option>
                <option value="2">Student2</option>
                <option value="3">Student3</option>
                <option value="4">Student4</option>
                <option value="5">Student5</option>
                <option value="6">Student6</option>
              </select>

我正在使用给定的代码来获取此输入字段的值。但我没有得到价值。

$studentname = array();
    $studentname =$this->input->post('student[]');
    echo 'studentName:'.$studentname;

你有什么建议吗？

Answer 1

您的值将发布在一个数组中：

$studentNames = $this->input->post('student');

然后您可以使用循环访问每个值：

foreach($studentNames as $name){
    echo "Student name is $name";
}

Answer 2

在回显帖子值时无需使用 []，您已在 name='student[]' 中定义；

 $studentname =$this->input->post('student');
    echo "<pre>";
    print_r($studentname);
    echo "</pre>";

Answer 3

为了命名，让它成为学生，因为它是多选的

<select class="js-example-basic-multiple  multiple_selection form-control" name="students[]" multiple="multiple"  >
    <option value="1">Student1</option>
    <option value="2">Student2</option>
    <option value="3">Student3</option>
    <option value="4">Student4</option>
    <option value="5">Student5</option>
    <option value="6">Student6</option>
 </select>

在控制器中：

//get the post values of students (if you dump the post you will see that $_POST['students'] is an array
$students = $this->input->post('students');

https://www.codeigniter.com/user_guide/libraries/input.html

//will contain the values of the selected students ex. var_dump($students) will produce [1,2,4];

//you will need to loop over students since it is an array

foreach($students as $id){
  echo "Student id is {$id}";
}