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@ 2014-04-16T13:04:14Z

<?php
$data = Array
(
    0 => Array
        (
            'entry_id' => 1,
            'ic' => 2147483647,
            'name' => 'Kořínková Blanka',
            'residency' => 'Štětí, Lukešova 354, 411 08',
            'file_no' => 'KSUL 77 INS 18898 / 2013',
            'detail' => '749371da-725c-4738-8def-2f7167142a6f'
        ),

    1 => Array
        (
            'entry_id' => 1,
            'ic' => 2147483647,
            'name' => 'Kořínková Blanka',
            'residency' => 'Štětí, Lukešova 354, 411 08',
            'file_no' => 'KSUL 77 INS 21218 / 2013',
            'detail' => '43b6a718-4647-451d-9c53-50dfee8403ff'
        ),

    2 => Array
        (
            'entry_id' => 2,
            'ic' => 46900217,
            'name' => 'ENTEC a.s. "v likvidaci"',
            'residency' => 'Staré Město, Brněnská 1916, 686 03',
            'file_no' => 'KSBR 28 INS 1232 / 2013',
            'detail' => 'e2155a52-c464-4357-b71b-4f4ff75585eb'
        )

);


$mergeId = 'entry_id';

$data = array_reduce($data, function($c, $x) use ($mergeId)
{
   $c[$x[$mergeId]] = isset($c[$x[$mergeId]])
      ?array_combine(
          $z=array_keys($c[$x[$mergeId]]), 
          array_map(function($y) use ($x, $c, $mergeId)
          {
             return in_array($x[$y], (array)$c[$x[$mergeId]][$y])
                ?$c[$x[$mergeId]][$y]
                :array_merge((array)$c[$x[$mergeId]][$y], [$x[$y]]);
          }, $z)
       )
      :$x;
   return $c;
}, []);


var_dump($data);

Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14: array(2) { [1]=> array(6) { ["entry_id"]=> int(1) ["ic"]=> int(2147483647) ["name"]=> string(19) "Kořínková Blanka" ["residency"]=> string(31) "Štětí, Lukešova 354, 411 08" ["file_no"]=> array(2) { [0]=> string(24) "KSUL 77 INS 18898 / 2013" [1]=> string(24) "KSUL 77 INS 21218 / 2013" } ["detail"]=> array(2) { [0]=> string(36) "749371da-725c-4738-8def-2f7167142a6f" [1]=> string(36) "43b6a718-4647-451d-9c53-50dfee8403ff" } } [2]=> array(6) { ["entry_id"]=> int(2) ["ic"]=> int(46900217) ["name"]=> string(24) "ENTEC a.s. "v likvidaci"" ["residency"]=> string(38) "Staré Město, Brněnská 1916, 686 03" ["file_no"]=> string(23) "KSBR 28 INS 1232 / 2013" ["detail"]=> string(36) "e2155a52-c464-4357-b71b-4f4ff75585eb" } }
Output for 5.3.0 - 5.3.29: Parse error: syntax error, unexpected '[' in /in/4uQCs on line 48
Process exited with code 255.

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