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@ 2020-08-07T16:08:53Z

<?php

$json = <<<JSON
{   
  "total":2000,
  "achievements":[
    {
       "id":6,
       "achievement":{},
       "criteria":{
          "id":2050,
          "is_completed":false
       },
       "completed_timestamp":1224053510000
    },
    {
       "id":8,
       "achievement":{},
       "criteria":{
          "id":1289,
          "is_completed":true
       },
       "completed_timestamp":1224053510000
    }
  ]
}
JSON;

try {
  $data = json_decode($json, false, 512, JSON_THROW_ON_ERROR);
  $completedAchievements = array_filter(
    $data->achievements, 
    static function (\stdClass $achievement): bool {
      return $achievement->criteria->is_completed === true;
    }
  );
  $completedAchievementsIds = array_column($completedAchievements, 'id');
  print_r($completedAchievementsIds);

} catch (JsonException $e) {
  echo $e->getMessage();
}

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [0] => 8 )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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