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<?php $array = [ '1' => true, ['2' => false, '4' => true], '3' => true ]; $matches = []; array_walk_recursive($array, function ($value, $key) use (&$matches) { if ($value === true) { $matches[] = $key; } }); print_r($matches);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => 1 [1] => 4 [2] => 3 )

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