jquery - How to fetch data from ajax in php -

i passing image form php page using ajax. problem data not getting fetched , giving blank output. following code:

test.php

<!-- taken http://stackoverflow.com/questions/24446281/passing-image-using-ajax-to-php -->  <form name="saveimg" enctype="multipart/form-data" id="saveimg"> <input type="file" name="imgvid" id="imgvid"> <button name="submit" id="submit">upload</button> <img src="skin/images/process.gif" id="procimg" height="32" width="auto" style="display:none;" /> </form>  <div id="msg"></div>            <!--jquery--> <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>  <script> document.getelementbyid("submit").addeventlistener("click", function(event){     event.preventdefault();     saveimgfunc(); });  function saveimgfunc(){     var form = new formdata(document.getelementbyid('saveimg'));     var file = document.getelementbyid('imgvid').files[0];     if (file) {            form.append('imgvid', file);     }     $.ajax({         type : 'post',         url : 'core/img.php',         data : form,         cache : false,         contenttype : false,         processdata : false     }).success(function(data){         console.log(data);     }); } 

img.php

<?php if(isset($_post['submit'])){     echo "data can fetched here"; } ?> 

kindly me issue. in advance.

change this:

if(isset($_post['submit'])){ 

to this:

if(isset($_post['imgvid'])){ 

---

because not posting 'submit' php. code of line

data : form, 

has this:

form.append('imgvid', file);