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@ 2014-08-04T09:35:41Z

<?php
    $merged_array = array();
    $final_array = array();
    $json[123]["data"]["categories"] = array(
                                            array(
                                              'id' => '2',
                                              'description' => 'Single-player'
                                            ),
                                            array(
                                              'id' => '1',
                                              'description' => 'Multi-player'
                                            ),
                                            array(
                                              'id' => '9',
                                              'description' => 'Co-op'
                                            ),
                                            array(
                                              'id' => '22',
                                              'description' => 'Steam Achievements'
                                            ),
                                            array(
                                              'id' => '28',
                                              'description' => 'Full controller support'
                                            )
                                          );
    $json[456]["data"]["categories"] = array(
                                            array(
                                              'id' => '21',
                                              'description' => 'Downloadable Content'
                                            )
                                          );
    $json[786]["data"]["categories"] = array(
                                            array(
                                              'id' => '31',
                                              'description' => 'Downloadable Content'
                                            )
                                          );
    $json[058]["data"]["categories"] = array(
                                            array(
                                              'id' => '41',
                                              'description' => 'Downloadable Content'
                                            )
                                          );

    foreach($json as $key=>$value){
        array_push($merged_array,$json[$key]["data"]["categories"]);      
    }

    foreach($merged_array as $value){
        foreach($value as $val){
            array_push($final_array,$val);      
        }
    }
    print_r($final_array);

?>

Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28: Array ( [0] => Array ( [id] => 2 [description] => Single-player ) [1] => Array ( [id] => 1 [description] => Multi-player ) [2] => Array ( [id] => 9 [description] => Co-op ) [3] => Array ( [id] => 22 [description] => Steam Achievements ) [4] => Array ( [id] => 28 [description] => Full controller support ) [5] => Array ( [id] => 21 [description] => Downloadable Content ) [6] => Array ( [id] => 31 [description] => Downloadable Content ) [7] => Array ( [id] => 41 [description] => Downloadable Content ) )

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