Bel

I did this code in HTML <label id="read" class="read" for="files">Choose:</label> <input type="file" accept="image/*|video/*" name="file" id="file" class="jump" multiple="true"> <input type="button" id="btlo" class="btload" name="load" value="Load" onclick="Load();"> and call function Load() below  function Load(){ var fileInput = document.getElementById("file"); var str = new FormData(); for (i = 0; i < fileInput.files.length; i++) { str.append(fileInput.files.name, fileInput.files); }   $.ajax({  url: "upload.php", method: "POST",  data: str, contentType: false,  cache: false, processData: false,  beforeSend:function(){ $('#respimg').html("Sending...");  }, success:function(data){  $('#msgret').html(data); } }); } PHP <?php $num = 2; if (isset($_FILES['file'])){ for ($i = 0; $i < $num; $i++) {  $nfile = $_FILES["file"]["name"][$i]; $tfile = $_FILES["file"]["size"][$i]; $ntemp = $_FILES["file"]["tmp_name"][$i]; }  It isn´t work with o if isset but without it´s giving this mensage Notice: Undefined index: file