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@ 2014-08-04T09:26:34Z

<?php
$json = array(
'123' => array('data' => array('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'
  		)
	))
              ),
'456' => array('data' => array('categories' => array(
  		array(
    		'id' => '21',
    		'description' => 'Downloadable Content'
  			)
		))
       ),
);

//print_r($json);

$merged = array();
foreach($json as $j1)
{
	foreach($j1 as $j2)
    {
		foreach($j2 as $key => $j3)
        {
            $merged[$key][] = $j3;
        }
    }
}

print_r($merged);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [categories] => Array ( [0] => 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 ) ) [1] => Array ( [0] => Array ( [id] => 21 [description] => Downloadable Content ) ) ) )

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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