PHP JSON Array - Group by the same value -

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i'm thinking how group array objects same value.

i have result mysql query:

   date           starttime           endtime 2014-12-01          08:00              12:00 2014-12-01          10:00              16:00 2014-12-02          12:00              18:00 2014-12-03          10:00              20:00

i have data in php variable called $data.

is possible json array php: ?

[     {         "2014-12-01": [             {                 "starttime": "08:00",                 "endtime": "12:00"             },             {                 "starttime": "10:00",                 "endtime": "16:00"             }         ]     },     {         "2014-12-02": [             {                 "starttime": "12:00",                 "endtime": "18:00"             }         ]     },     {         "2014-12-03": [             {                 "starttime": "10:00",                 "endtime": "20:00"             }         ]     } ]

if use echo json_encode($data), result is:

[     {         "date": "2014-12-01",         "starttime": "10:00",         "endtime": "16:00"     },     {         "date": "2014-12-02",         "starttime": "12:00",         "endtime": "18:00"     },     {         "date": "2014-12-03",         "starttime": "10:00",         "endtime": "20:00"     } ]

based on structure outlined in question:

requires php 5.4+ json pretty printing, if on lower version remove , use long array format.

$in = <<<'json' [     {         "date": "2014-12-01",         "starttime": "10:00",         "endtime": "16:00"     },     {         "date": "2014-12-02",         "starttime": "12:00",         "endtime": "18:00"     },     {         "date": "2014-12-03",         "starttime": "10:00",         "endtime": "20:00"     },     {         "date": "2014-12-03",         "starttime": "12:00",         "endtime": "20:00"     } ] json;  $data = json_decode($in, true); $out = [];  foreach($data $element) {         $out[$element['date']][] = ['starttime' => $element['starttime'], 'endtime' => $element['endtime']]; }  var_dump(json_encode($out, json_pretty_print));

to exact same output in question (the returned output wrapped in single element json-array you'd need wrap $out in other array this:

json_encode([$out], json_pretty_print)

results in:

{   "2014-12-01": [     {       "starttime": "10:00",       "endtime": "16:00"     }   ],   "2014-12-02": [     {       "starttime": "12:00",       "endtime": "18:00"     }   ],   "2014-12-03": [     {       "starttime": "10:00",       "endtime": "20:00"     },     {       "starttime": "12:00",       "endtime": "20:00"     }   ] }

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