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<?php $array = [ ["444", "0081"], ["449", "0081"], ["451", "0081"], ["455", "2100"], ["469", "2100"] ]; foreach ($array as $row) { if (!isset($result[$row[1]])) { $result[$row[1]] = $row; } else { $result[$row[1]][0] .= ',' . $row[0]; } } var_export(array_values($result));
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 0 => '444,449,451', 1 => '0081', ), 1 => array ( 0 => '455,469', 1 => '2100', ), )

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