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<?php $a = [ ['l' => 1, 's' => 'a'], ['l' => 2, 's' => 'a'], ['l' => 3, 's' => 'b'], ]; $processed = []; foreach ($a as $v) { $processed[$v['s']][] = $v['l']; } $processed = array_map(function($v) {return implode(',', $v);}, $processed); print_r($processed);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [a] => 1,2 [b] => 3 )

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