php - How to check if ajax return exist?

I have an ajax
request:

$.ajax({
 url:
            'DBConnector.php',
 type: 'GET',
 dataType:
            'json',

 success: function(data){
//check if
            exist
}
});

This
is what i return:

echo
            json_encode(array("data" => $returnValue , "status" =>
            "false"));

How
to check if status exist(not to be false but really if it
exist)?

Answer

You can try the
following:

$.ajax({

            url: 'DBConnector.php',
 type: 'GET',
 dataType: 'json',

            success: function(data)

 {
 if(data.status !==
            undefined)
 {
 //YOUR CODE HERE
 }

            }
});

It
will check if the status exists or
not.