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@ 2016-08-25T07:50:34Z

<?php

$json = <<<JSON
[{
  "updatedDate": null,
  "active": true,
  "id": 80,
  "lessonName": "HZİ 413 Language in Use",
  "educationDegree": "Lisans",
  "academicYear": "2013-2014",
  "language": "İngilizce",
  "lessonHour": 4,
  "addedDate": "2014-02-21T19:54:23+0000"
}, {
  "updatedDate": null,
  "active": true,
  "id": 81,
  "lessonName": "HZİ 411 English in Context I",
  "educationDegree": "Lisans",
  "academicYear": "2013-2014",
  "language": "İngilizce",
  "lessonHour": 8,
  "addedDate": "2014-02-21T19:53:47+0000"
}, {
  "updatedDate": null,
  "active": true,
  "id": 82,
  "lessonName": "HZİ 512 English in Context II ",
  "educationDegree": "Lisans",
  "academicYear": "2014-2015",
  "language": "İngilizce",
  "lessonHour": 12,
  "addedDate": "2014-02-21T19:52:44+0000"
}]
JSON;

$input = json_decode($json, true);

$groups = [];
$groupBy = 'academicYear';

foreach ($input as $element) {
    if (!array_key_exists($element[$groupBy], $groups)) {
        $groups[$element[$groupBy]] = [];
    }

    $groups[$element[$groupBy]][] = $element;
}

print_r($groups);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [2013-2014] => Array ( [0] => Array ( [updatedDate] => [active] => 1 [id] => 80 [lessonName] => HZİ 413 Language in Use [educationDegree] => Lisans [academicYear] => 2013-2014 [language] => İngilizce [lessonHour] => 4 [addedDate] => 2014-02-21T19:54:23+0000 ) [1] => Array ( [updatedDate] => [active] => 1 [id] => 81 [lessonName] => HZİ 411 English in Context I [educationDegree] => Lisans [academicYear] => 2013-2014 [language] => İngilizce [lessonHour] => 8 [addedDate] => 2014-02-21T19:53:47+0000 ) ) [2014-2015] => Array ( [0] => Array ( [updatedDate] => [active] => 1 [id] => 82 [lessonName] => HZİ 512 English in Context II [educationDegree] => Lisans [academicYear] => 2014-2015 [language] => İngilizce [lessonHour] => 12 [addedDate] => 2014-02-21T19:52:44+0000 ) ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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