php - 带有多个文件的文件上传无法正常工作

Question

我的代码有这个奇怪的问题：

共有三个输入file标签。这些是上传场景及其结果：

1. 同时所有三个文件 - 成功
2. 只有图片 - 成功
3. 只有音频 - 失败
4. 只有视频 - 失败
5. 一图一音——图成功，音频失败
6. 一图一视频——图片成功，视频失败

7. 一个音频和一个视频 - 其中一个成功

   <?php 
   session_start(); 
   if(!isset($_SESSION["username"])){
       header('Location: index.php');
   }
   if(isset($_POST["year"])){
       ini_set('display_errors',1);
       error_reporting(E_ALL);
       var_dump($_FILES);
       $year = $_POST["year"];
       $height = $_POST["height"];
       $weight = $_POST["weight"];
       $school = $_POST["school"];
       $class = $_POST["class"];
       $target_dir_img = "./pictures/";
       $target_dir_aud = "./audios/";
       $target_dir_vid = "./videos/";
   
       $uploadOk = 1;
   
       $target_files = array();
   
       $target_img = basename($_FILES['uploadedFiles']['name'][0]);
       var_dump($target_img);
       if(strcmp($target_img,'')){
           $imageFileType = pathinfo($target_img,PATHINFO_EXTENSION);
   
           $newImageName = $target_dir_img . $_SESSION['username']."_".$_POST['year'].".". $imageFileType;
   
           if($imageFileType != "jpg" && $imageFileType != "jpeg") {
               echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
               $uploadOk = 0;
           }
           else {
               $target_files[] = $newImageName;
           }
       }
   
       // Allow certain file formats
   
       $target_aud = basename($_FILES['uploadedFiles']['name'][1]);
       var_dump($target_aud);
       if(strcmp($target_aud,'')) {
   
           $audioFileType = pathinfo($target_aud, PATHINFO_EXTENSION);
   
           $newAudioName = $target_dir_aud . $_SESSION['username']."_".$_POST['year'].".". $audioFileType;
   
           if($audioFileType != "mp3") {
               echo "Sorry, only MP3 files are allowed.";
               $uploadOk = 0;
           }
           else {
               $target_files[] = $newAudioName;
           }
       }
   
       $target_vid = basename($_FILES['uploadedFiles']['name'][2]);
       var_dump($target_vid);
       if(strcmp($target_vid,'')){
   
           $videoFileType = pathinfo($target_vid, PATHINFO_EXTENSION);
   
           $newVideoName = $target_dir_vid . $_SESSION['username']."_".$_POST['year'].".". $videoFileType;
   
           if($videoFileType != "mp4") {
               echo "Sorry, only MP4 files are allowed.";
               $uploadOk = 0;
           }
           else {
               $target_files[] = $newVideoName;
           }
       }
   
       var_dump($target_files);
   
       // Check if $uploadOk is set to 0 by an error
       if ($uploadOk == 0) {
           echo "Sorry, your file was not uploaded.";
       // if everything is ok, try to upload file
       } else {
           for($i=0; $i<sizeof($target_files); $i++){
               if (move_uploaded_file($_FILES['uploadedFiles']['tmp_name'][$i], $target_files[$i])) {
                   echo "The file ". basename( $_FILES['uploadedFiles']['name'][$i]). " has been uploaded.";
               } else {
                   echo "Sorry, there was an error uploading your file.";
               }
           }
       }
   }
   ?>
   
   
   <h1>Welcome <?php echo $_SESSION["username"]; ?>!</h1>
   
   <h2>Data</h2>
   <form action="" method="POST" enctype="multipart/form-data">
       <p><label>Select Year : </label>
       <select id="year" name="year">
           <?php 
               for($i=1901; $i<=2020; $i++){
                   echo '<option value="'.$i.'">'.$i.'</option>';
               }
           ?>
       </select></p>
       <p><label>Height : </label>
       <input type="text" id="height" name="height" placeholder="Height" /></p>
       <p><label>Weight : </label>
       <input type="text" id="weight" name="weight" placeholder="Weight" /></p>
       <p><label>School : </label>
       <input type="text" id="school" name="school" placeholder="School" /></p>
       <p><label>Class : </label>
       <input type="text" id="class" name="class" placeholder="Class" /></p>
       <p><label>Choose picture : </label>
       <input type="file" id="picture" name="uploadedFiles[]" accept="image/jpeg, image/jpg" /></p>
       <p><label>Choose Audio : </label>
       <input type="file" id="audio" name="uploadedFiles[]" accept="audio/mp3" /></p>
       <p><label>Choose Video : </label>
       <input type="file" id="video" name="uploadedFiles[]" accept="video/mp4" /></p>
   
       <input type="submit" id="submit" name="submit" value="submit" /></p>
   </form>
   

关于它如何发生的任何输入？