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<?php $array = [ ['toxic', 'irritant', 'flammable'], ['toxic', 'irritant'], ['toxic'], ]; $iterator = new RecursiveIteratorIterator( new RecursiveArrayIterator($array) ); $result = []; foreach ($iterator as $leafNode) { $result[$leafNode] = ($result[$leafNode] ?? 0) + 1; } var_export($result);
Output for git.master, git.master_jit, rfc.property-hooks
array ( 'toxic' => 3, 'irritant' => 2, 'flammable' => 1, )

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