如何在php中获取选择框的多个选定值？

Z时代
2024-01-10
分类：IT

给定项目列表, 任务是使用PHP从选择框中检索多个选择的值。

在HTML中使用Multiple属性从下拉列表中选择多个值。在HTML中选择多个值取决于操作系统和浏览器。

对于窗口用户–按住+ CTRL键选择多个选项

对于Mac用户-按住Command键可选择多个选项

例子：本示例使用HTML创建项目列表。

<html>
     <body>
         <form method = "post" action = "name.php">
             <h4>SELECT SUJECTS</h4>
             <!--Using multiple to select multiple value-->
             <select name = "subject" multiple size = 6>  
                 <option value = "english">ENGLISH</option>
                 <option value = "maths">MATHS</option>
                 <option value = "computer">COMPUTER</option>
                 <option value = "physics">PHYSICS</option>
                 <option value = "chemistry">CHEMISTRY</option>
                 <option value = "hindi">HINDI</option>
             </select>
             <input type = "submit" name = "submit" value = Submit>
         </form>
     </body></html>

现在, 任务是从列表中检索或打印多个选定的值。使用表单方法和循环来检索PHP中的选定值。

例子：

<html>
     <body>
         <!--name.php to be called on form submission-->
         <form method = 'post'> 
             <h4>SELECT SUJECTS</h4>
             <select name = 'subject[]' multiple size = 6>  
                 <option value = 'english'>ENGLISH</option>
                 <option value = 'maths'>MATHS</option>
                 <option value = 'computer'>COMPUTER</option>
                 <option value = 'physics'>PHYSICS</option>
                 <option value = 'chemistry'>CHEMISTRY</option>
                 <option value = 'hindi'>HINDI</option>
             </select>
             <input type = 'submit' name = 'submit' value = Submit>
         </form>
     </body>
</html>
<?php
     //Check if form is submitted successfully
     if (isset( $_POST [ "submit" ])) 
     {
         //Check if any option is selected
         if (isset( $_POST [ "subject" ])) 
         {
             //Retrieving each selected option
             foreach ( $_POST [ 'subject' ] as $subject ) 
                 print "You selected $subject<br/>" ;
         }
     else
         echo "Select an option first !!" ;
     }?>