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Output for 7.2.29 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.32, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.32, 8.2.0 - 8.2.28, 8.3.0 - 8.3.20, 8.4.1 - 8.4.6
<? $names = []; $names[0]['Name'] = 'Rahul'; $names[1]['Name'] = 'Rahul'; $names[2]['Name'] = 'Rahul'; $names[0]['surname'] = 'M'; $names[1]['surname'] = 'D'; $names[2]['surname'] = 'F'; $commonNames = []; if (! empty($names)) { foreach($names as $name) { $commonNames[0][$name['Name']][] = $name['surname']; } } echo '<pre>';print_r($commonNames);echo '</pre>'; ?>
Output for 7.1.25 - 7.1.27, 7.2.0 - 7.2.16, 7.3.0 - 7.3.3, 7.3.32 - 7.3.33, 7.4.33, 8.0.13
<pre>Array ( [0] => Array ( [Rahul] => Array ( [0] => M [1] => D [2] => F ) ) ) </pre>

preferences:
160.58 ms | 413 KiB | 5 Q