Ask a question about mysql traversal to json

Ask a question about mysql traversing to json. I use PHP to pass a value to JqueryAJAX. $. parseJSON parsing I have learned how to query a record. if you want to upload multiple records. there is a problem. // A record // $ row = mysql_fetch_array ($ result); // echojson_encode ($ ask a question about mysql traversal to json.
I used PHP to pass a value to Jquery AJAX. I used $. parseJSON for parsing.
I have learned how to query a record. if I want to upload multiple records, it will be a problem.


// One record
// $ Row = mysql_fetch_array ($ result );
// Echojson_encode ($ row );
// Multiple records
While ($ row = mysql_fetch_array ($ result )){
Echo json_encode ($ row );
};


In this way, if there are two pieces of data, return such a json

{"0": "68", "id": "68", "1": "90", "top": "90", "2 ": "120", "lef": "120", "3": "u2", "uid": "u2"} {"0": "92 ", "id": "92", "1": "40", "top": "40", "2": "320", "lef": "320 ", "3": "u1", "uid": "u1 "}

$. ParseJSON cannot be parsed. Is there a solution?

------ Solution --------------------
While ($ row = mysql_fetch_array ($ result )){
$ Res [] = $ row;
}
Echo json_encode ($ res );