这里的phpmailer文件上传有什么问题？

Question

我试图通过phpmailer上传文件。已经看过了一些文档和解决方案，但无法找到为什么要抛给我这个错误“未定义的数组键”附件.““试图访问null类型值上的数组偏移量”我使用browser的网络选项卡检查了我的有效负载，它清楚地显示了附件的存在。所有其他字段都按照预期完美地工作，接收所有字段的邮件，但无法获得附件，上载文件夹就在处理程序文件所在的当前目录中。我做错了什么？

这是我的前端部分：“

    <form action="handler-att.php" method="post">
     <!--the first and last names -->
     <div class="row mb-4">
         <div class="col-lg-6 col-sm-12">
             <div class="form-outline">
                 <input id="first-name" class="form-control" required="" name="first_name" placeholder="First Name*"
                     type="text" />
                 <!-- <label class="form-label" for="first-name">First name</label> -->
             </div>
         </div>
         <div class="col-lg-6 col-sm-12">
             <div class="form-outline">
                 <input id="last-name" class="form-control" required="" name="last_name" placeholder="Last Name*"
                     type="text" />
                 <!-- <label class="form-label" for="last-name">Last name</label> -->
             </div>
         </div>
     </div>

     <!-- Email Mobile input -->
     <div class="row mb-4">
         <div class="col-lg-6 col-sm-12">
             <div class="form-outline">
                 <input id="register-email" class="form-control" name="register_email" required
                     placeholder="Email Address*" type="email" />
                 <!-- <label class="form-label" for="register-email">Email</label> -->
             </div>
         </div>
         <div class="col-lg-6 col-sm-12">
             <div class="form-outline">
                 <input id="mobile-number" class="form-control" name="mobile_number" required
                     placeholder="Mobile Number*" type="tel" maxlength="10" pattern="^[6-9]\d{9}$"
                     title="Please enter a valid number" />
                 <!-- <label class="form-label" for="mobile-number">Phone</label> -->
             </div>
         </div>
     </div>

     <!-- Dropdown input -->
     <div class="row mb-4">
         <div class="col-lg-12 col-sm-12">
             <div class="form-outline">
                 <select id="college-select" class="form-select" aria-label="Default select example" required
                     name="course_preference">
                     <option value="" selected disabled hidden="">Select the course you are interested in</option>

                     <option value="B.Ed">B.Ed</option>
                     <option value="M.Ed">M.Ed</option>
                     <option value="D.El.Ed">D.El.Ed</option>
                     <option value="GNM Nursing">GNM Nursing</option>
                     <option value="B.Sc Nursing">B.Sc Nursing</option>
                     <option value="Engineering">Engineering</option>
                 </select>
                 <!-- <label class="form-label" for="college-select">Select College</label> -->
             </div>
         </div>

     </div>

     <!-- ===File attachemnt==== -->
     <input type="file" id="attachment" name="attachment">

     <!-- Message input -->
     <div class="form-outline mb-4">
         <textarea class="form-control" id="description" name="description" rows="6" required></textarea>
         <!-- <label class="form-label" for="description">Tell Us About Yourself</label> -->
     </div>

     <!-- Submit button -->
     <button type="submit" class="btn-lg btn-primary btn-block mb-4 contact-btn ps-5 pe-5">Send Enquiry &nbsp;
         &nbsp; &nbsp;<span class="bi-arrow-right"></span></button>
 </form>

下面是我的phpmailer代码的附件部分：

   if($_FILES['attachment']['name']!=null){
      if(move_uploaded_file($_FILES['attachment']['tmp_name'], "uploads/{$_FILES['attachment']['name']}"))
         {
          $mail->addAttachment("uploads/{$_FILES['attachment']['name']}");
      }
      }

Answer 1

您忘了将enctype="multipart/form-data"放在表单标记中。文件只能在带有这种编码的表单中附加。

  <form action="handler-att.php" method="post" enctype= "multipart/form-data">