$.ajax({
        async: false,
        url: 'scripts/getDataforUser.php?firstName=' + _firstName+ '&lastName=' + _lastName,
        dataType: "json",
        success: function(result) {
          //Do stuff with 'result' object
          //result object sometimes comes back empty
        },
        error:function (xhr, ajaxOptions, thrownError){
             displayError('An error occurred while fetching data');
             return;
          }
      });

;;;;;;;;;;;;;;;;;;;
; Resource Limits ;
;;;;;;;;;;;;;;;;;;;

max_execution_time = 600     ; Maximum execution time of each script, in seconds
max_input_time = 180 ; Maximum amount of time each script may spend parsing request data
memory_limit = 128M      ; Maximum amount of memory a script may consume (128MB)

[0] => Array
        (
            [0] => 08S01
            [SQLSTATE] => 08S01
            [1] => 258
            [code] => 258
            [2] => [Microsoft][SQL Server Native Client 11.0]TCP Provider: Timeout error [258].
            [message] => [Microsoft][SQL Server Native Client 11.0]TCP Provider: Timeout error [258].
        )

    [1] => Array
        (
            [0] => 08S01
            [SQLSTATE] => 08S01
            [1] => 258
            [code] => 258
            [2] => [Microsoft][SQL Server Native Client 11.0]Communication link failure
            [message] => [Microsoft][SQL Server Native Client 11.0]Communication link failure
        )

    [2] => Array
        (
            [0] => 08S01
            [SQLSTATE] => 08S01
            [1] => -2147467259
            [code] => -2147467259
            [2] => [Microsoft][SQL Server Native Client 11.0]Communication link failure
            [message] => [Microsoft][SQL Server Native Client 11.0]Communication link failure
        )

$.ajax({.... data: { firstName: "bob", lastName: "smith" } });