title: If Or Statement not working PHP
body: <p>I am making a site where you can upload files. I just want people to upload Word, Powerpoint, Excel, PDF and JPG files. Therefore, I made this if-statement:</p>
  
  <pre><code>$target_dir = "files/";
  $target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
  $filename = basename($_FILES["fileToUpload"]["name"]);
  $uploadOk = 1;
  $fileType = pathinfo($target_file,PATHINFO_EXTENSION);
  // Check if file selected
  if (!isset($_FILES['fileToUpload']) || $_FILES['fileToUpload']['error'] == UPLOAD_ERR_NO_FILE) {
      $msg = "No file selected. Try again.";
      $uploadOk = 0;
  
  } elseif (file_exists($target_file)) { // does file already exist?
      $msg = "File already exists.";
      $uploadOk = 0;
  
  } elseif ($_FILES["fileToUpload"]["size"] &gt; 10485760) { // filesize
      $msg = "File too huge.";
      $uploadOk = 0;
  
  // THE PROBLEM IS IN THE FOLLOWING STATEMENT
  
  } elseif ($fileType != "jpg" || $fileType != "doc" || $fileType != "docx" || $fileType != "ppt" || $fileType != "pptx" || $fileType != "xls" || $fileType != "xlsx" || $fileType != "pdf") {
      $msg = "Filetype not allowed";
      $uploadOk = 0;
  }
  
  if ($uploadOk != 0) {
      if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
          $msg = "File uploaded.";
      } else {
          $msg = "File not uploaded.";
      }
  </code></pre>
  
  <p>However, when I upload a JPG,PDF,PHP or whatever, it always gives the error : Filetype not allowed. What am I doing wrong?</p>