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@ 2017-08-23T09:55:23Z

<?php

$json_data = '[
    {"name":"Location 1","gigs": 
        {"start":"16:30","end":"21:15","title":"TestTitle1","class":"fri"}
    },
    {"name":"Location 2","gigs":
        {"start":"15:00","end":"19:00","title":"TestTitle2","class":"fri"}
    },
    {"name":"Location 1","gigs":
        {"start":"21:00","end":"22:00","title":"TestTitle3","class":"fri"}
    }
]';
$arr = json_decode($json_data,true);
$new_array = array();
foreach ($arr as $key => $value) {
  if(isset($new_array[$value['name']]))
      $new_array[$value['name']]['gigs'][] = $value['gigs']; //add already array existing value
    else{
      $new_array[$value['name']]['name'] = $value['name'];
      $new_array[$value['name']]['gigs'][] = $value['gigs']; //create array
    }
}
$new_array = array_values($new_array); //to remove keys
echo json_encode($new_array);

Output for git.master, git.master_jit, rfc.property-hooks: [{"name":"Location 1","gigs":[{"start":"16:30","end":"21:15","title":"TestTitle1","class":"fri"},{"start":"21:00","end":"22:00","title":"TestTitle3","class":"fri"}]},{"name":"Location 2","gigs":[{"start":"15:00","end":"19:00","title":"TestTitle2","class":"fri"}]}]

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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