Warning: file_put_contents(): failed to open stream:

[Bradeigh9991]

I'm just started learning Programming and have tryed to create a Drag and Drop upload form. The problem that I am having is that when I drag and drop a file on to my drop area I receive a post code of 200 which show that its ok. After checking my upload directory the file was not uploaded and I have an error of:

Warning: file_put_contents(../../../media/SeagateHDD/Uploads/): failed to open stream: Is a directory in /var/www/PHP/Drop_Upload.php on line 10. File Uploaded Successfully

I belive that this means that my upload path is not correct
but I have check four times and the path is correct. I then changed the permissions to 777 and still get the same 200 code with error. Can anyone help me?

My Jquery is:

$(function(){
 
    var obj = $('#Upload_form');
 
    obj.on('dragover', function(e){
        //prevent browser from open the file when drop off
        e.stopPropagation();
        e.preventDefault();
        $(this).css('border',"3px solid #000000");
    });
 
    obj.on('dragleave', function(e){
        //prevent browser from open the file when drop off
        e.stopPropagation();
        e.preventDefault();
        $(this).css('border',"3px dashed #4a4a4a");
    });
 
    obj.on('drop',function(e){
        //prevent browser from open the file when drop off
        e.stopPropagation();
        e.preventDefault();
        $(this).css('border',"3px dashed #4a4a4a");
 
        //retrieve uploaded files data
        var files = e.originalEvent.dataTransfer.files;
        var file = files[0];
 
        upload(file);
    });
 
    function upload(file){
        xhr = new XMLHttpRequest();
 
        //initiate Request
        xhr.open('post','../PHP/Drop_Upload.php');
 
        //set headers
        xhr.setRequestHeader('Content-Type', "multipart/form-data");
        xhr.setRequestHeader('X-File-Name',file.fileName);
        xhr.setRequestHeader('X-File-Size',file.fileSize);
        xhr.setRequestHeader('X-File-Type',file.fileType);
 
        //send the file
        xhr.send(file);
    }
});
 
And my PHP is:
<?php
 
$string =file_get_contents('php://input');
$path = '../media/SeagateHDD/Uploads/';
 
if ( !file_exists($path) ) {
  mkdir ($path, 0777);
 }
 
file_put_contents($path,$string);
 
echo 'File Uploaded Successfully';