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@ 2020-01-01T08:12:23Z

<?php

$competence = json_decode('[
    {
      "id": "21",
      "title": "blabla",
      "description": "blabla",
      "image": "blabla"
    },
    {
      "id": "11",
      "title": "blabla",
      "description": "blabla",
      "image": "blabla"
    },
    {
      "id": "26",
      "title": "blabla",
      "description": "blabla",
      "image": "blabla"
    }
  ]', true);
$schedule = json_decode('[
    {
      "id": "34",
      "parent_id": "21",
      "title": "blabla",
      "description": "blabla",
      "image": "blabla"
    },
    {
      "id": "33",
      "parent_id": "21",
      "title": "blabla",
      "description": "blabla",
      "image": "blabla"
    },
    {
      "id": "32",
      "parent_id": "11",
      "title": "blabla",
      "description": "blabla",
      "image": "blabla"
    },
    {
      "id": "31",
      "parent_id": "26",
      "title": "blabla",
      "description": "blabla",
      "image": "blabla"
    }
  ]', true);

foreach ($schedule as $s) {
    // find the parent_id in $competence
    if (($key = array_search($s['parent_id'], array_column($competence, 'id'))) !== false) {
        $competence[$key]['schedule'][] = $s;
    }
}
$response = array('competence' => $competence);

echo json_encode($response, JSON_PRETTY_PRINT);

Output for git.master, git.master_jit, rfc.property-hooks: { "competence": [ { "id": "21", "title": "blabla", "description": "blabla", "image": "blabla", "schedule": [ { "id": "34", "parent_id": "21", "title": "blabla", "description": "blabla", "image": "blabla" }, { "id": "33", "parent_id": "21", "title": "blabla", "description": "blabla", "image": "blabla" } ] }, { "id": "11", "title": "blabla", "description": "blabla", "image": "blabla", "schedule": [ { "id": "32", "parent_id": "11", "title": "blabla", "description": "blabla", "image": "blabla" } ] }, { "id": "26", "title": "blabla", "description": "blabla", "image": "blabla", "schedule": [ { "id": "31", "parent_id": "26", "title": "blabla", "description": "blabla", "image": "blabla" } ] } ] }

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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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