title: File uploading script throwing error: "Invalid File"
body: <p>i am new leaner for php. i was trying to upload a simple thing but it does not works.. help to figure out i have referred in w3school.. i have a code.. and i have create a folder called upload.. why its not works..</p>
  
  <pre><code>&lt;html&gt;
  &lt;body&gt;
  
   &lt;form action="upload_file.php" method="post"
   enctype="multipart/form-data"&gt;
   &lt;label for="file"&gt;Filename:&lt;/label&gt;
   &lt;input type="file" name="file" id="file"&gt;&lt;br&gt;
    &lt;input type="submit" name="submit" value="Submit"&gt;
    &lt;/form&gt;
  
     &lt;/body&gt;
   &lt;/html&gt;
  </code></pre>
  
  <p>upload_file.php</p>
  
  <pre><code>        &lt;?php
           $allowedExts = array("gif", "jpeg", "jpg", "png");
            $extension = end(explode(".", $_FILES["file"]["name"]));
           if ((($_FILES["file"]["type"] == "image/gif")
          || ($_FILES["file"]["type"] == "image/jpeg")
          || ($_FILES["file"]["type"] == "image/jpg")
          || ($_FILES["file"]["type"] == "image/pjpeg")
          || ($_FILES["file"]["type"] == "image/x-png")
          || ($_FILES["file"]["type"] == "image/png"))
          &amp;&amp; ($_FILES["file"]["size"] &lt; 20000)
          &amp;&amp; in_array($extension, $allowedExts))
         {
         if ($_FILES["file"]["error"] &gt; 0)
        {
        echo "Return Code: " . $_FILES["file"]["error"] . "&lt;br&gt;";
       }
        else
     {
         echo "Upload: " . $_FILES["file"]["name"] . "&lt;br&gt;";
         echo "Type: " . $_FILES["file"]["type"] . "&lt;br&gt;";
         echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB&lt;br&gt;";
         echo "Temp file: " . $_FILES["file"]["tmp_name"] . "&lt;br&gt;";
  
           if (file_exists("upload/" . $_FILES["file"]["name"]))
            {
             echo $_FILES["file"]["name"] . " already exists. ";
              }
            else
            {
             move_uploaded_file($_FILES["file"]["tmp_name"],
            "upload/" . $_FILES["file"]["name"]);
          echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
             }
             }
             }
       else
        {
           echo "Invalid file";
          }
       ?&gt;
  </code></pre>