php - Multidimensional array json_encoded -


i try return multidimensional array of dates , revenues each date json array in order display chart in panel dashboard. unfortunately chart makes problem, when don't hardcode json array, debugging right , wonder why json_encoded array looks strange.

this panel, draws chart , requests data data.php:

jquery.getjson("data.php", { request: "revenues" }, function (result) {     var revenues = result["amount"];     alert(revenues);     $(".monthly-sales").sparkline(revenues, {         type: 'bar',         barcolor: '#ff4e50',         height: '55px',         width: '100%',         barwidth: 8,         barspacing: 1     }); });

the data.php:

elseif($request == "revenues"){     // output revenues per day nexus store     $revenues = array();     $revenues["dates"] = array();     $revenues["amount"] = array();     $sql = "select i_total revenue, date(from_unixtime(i_date)) date nexus_invoices i_status='paid' group date(from_unixtime(i_date)) order i_date desc limit 0,10";     $rows = $db->query($sql);     foreach($rows $row){         $revenues["dates"][] = $row['date'];         $revenues["amount"][] = floatval($row['revenue']);     }     //$revenues["amount"] = [1,5,5.5,5.4,5.8,6,8,9,13,12,10,11.5,9,8,5,8,9];     echo json_encode($revenues); }

the json result of code how expect it: 

{     "dates":[         "2015-06-13","2015-06-12","2015-06-10","2015-06-09","2015-06-07",         "2015-06-06","2015-06-05","2015-06-04","2015-06-02","2015-05-31"     ],     "amount":[8,22,8,8,22,8,8,8,8,8] }

unfortunately doesn't work unknown reason. debug further have uncommented line hardcodes $revenues["amount"] , commented second line of foreach. worked fine. result of json_encoded echo this:

{     "dates":[         "2015-06-13","2015-06-12","2015-06-10","2015-06-09","2015-06-07",         "2015-06-06","2015-06-05","2015-06-04","2015-06-02","2015-05-31"     ],     "amount":[1,5,5.5,5.4,5.8,6,8,9,13,12,10,11.5,9,8,5,8,9] }

how looks when hardcode array: enter image description here

how looks when fill array database: enter image description here

i think problem not in json array rather sparkline plugin.

try adding when display db data: chartrangemin:5 

$(".monthly-sales").sparkline(revenues, {         type: 'bar',         barcolor: '#ff4e50',         height: '55px',         width: '100%',         barwidth: 8,         barspacing: 1,        chartrangemin:5      });

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