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<?php $array = [ ['group' => 1, 'animal' => 'ape'], ['group' => 1, 'animal' => 'bat'], ['group' => 1, 'animal' => 'cat'], ['group' => 2, 'animal' => 'dog'], ['group' => 1, 'animal' => 'eel'], ['group' => 3, 'animal' => 'fox'], ['group' => 1, 'animal' => 'gnu'], ['group' => 2, 'animal' => 'hog'], ]; $result = []; foreach ($array as $row) { $result[$row['group']] ??= $row + ['count' => 0]; ++$result[$row['group']]['count']; } var_export(array_values($result));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 'group' => 1, 'animal' => 'ape', 'count' => 5, ), 1 => array ( 'group' => 2, 'animal' => 'dog', 'count' => 2, ), 2 => array ( 'group' => 3, 'animal' => 'fox', 'count' => 1, ), )

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