Combine several sub-arrays to accumulate ratings, Php - rextester

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Combine several sub-arrays to accumulate ratings

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<?php //php 7.0.8
$in=array(
  array (
      array (
    'skillName' => 'JDK',
    'comments' => '',
    'jobRating' => '2',
    'userRating' => '3',
    'skillGap' => '-1',
    'hrRating' => '2',
  ),  array (
    'skillName' => 'Java Servlets',
    'comments' =>'',
    'jobRating' =>'4',
    'userRating' =>'3',
    'skillGap' => '1',
    'hrRating' => '3',
  ),
 ), 
  array (
      array (
        'skillName' => 'JDK',
        'comments' => '',
        'jobRating' => '2',
        'userRating' => '3',
        'skillGap' => '-1',
        'hrRating' => '7',
      ),
      array (
        'skillName' => 'Java Servlets',
        'comments' =>'',
        'jobRating' =>'4',
        'userRating' =>'3',
        'skillGap' => '1',
        'hrRating' => '2',
      ),
    ),
  array (
    array (
        'skillName' => 'JDK',
        'comments' => 'not bad',
        'jobRating' => '3',
        'userRating' => '3',
        'skillGap' => '-1',
        'hrRating' => '4',
      ), 
    array (
        'skillName' => 'Java Servlets',
        'comments' =>'',
        'jobRating' =>'8',
        'userRating' =>'3',
        'skillGap' => '1',
        'hrRating' => '1',
      ),
    ));

foreach ($in as $i => $na) foreach($na as $j => $aa) {
  $skill=$aa['skillName'];unset($aa['skillName']);
  foreach ($aa as $k => $v) $ret[$skill][$k][]=$v;
}

print_r($ret);

?>

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Absolute running time: 0.12 sec, cpu time: 0.08 sec, memory peak: 8 Mb, absolute service time: 0,13 sec

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Array
(
    [JDK] => Array
        (
            [comments] => Array
                (
                    [0] => 
                    [1] => 
                    [2] => not bad
                )

            [jobRating] => Array
                (
                    [0] => 2
                    [1] => 2
                    [2] => 3
                )

            [userRating] => Array
                (
                    [0] => 3
                    [1] => 3
                    [2] => 3
                )

            [skillGap] => Array
                (
                    [0] => -1
                    [1] => -1
                    [2] => -1
                )

            [hrRating] => Array
                (
                    [0] => 2
                    [1] => 7
                    [2] => 4
                )

        )

    [Java Servlets] => Array
        (
            [comments] => Array
                (
                    [0] => 
                    [1] => 
                    [2] => 
                )

            [jobRating] => Array
                (
                    [0] => 4
                    [1] => 4
                    [2] => 8
                )

            [userRating] => Array
                (
                    [0] => 3
                    [1] => 3
                    [2] => 3
                )

            [skillGap] => Array
                (
                    [0] => 1
                    [1] => 1
                    [2] => 1
                )

            [hrRating] => Array
                (
                    [0] => 3
                    [1] => 2
                    [2] => 1
                )

        )

)

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