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<?php $daftar_penumpang =["sandhika",null,"carl","keith"]; array_walk($daftar_penumpang, function($v, $k, $prefix) use (&$daftar_penumpang) { if ($v == null) { $daftar_penumpang[$k] = $prefix; } }, 'test'); print_r($daftar_penumpang);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => sandhika [1] => test [2] => carl [3] => keith )

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