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<?php $arr = array( array('X-Powered-By' => array('Servlet/3.0') ), array('x-willy-info' => array('test') )); echo implode(": ", array_map(function ($val) { var_dump($val); }, $arr));
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { ["X-Powered-By"]=> array(1) { [0]=> string(11) "Servlet/3.0" } } array(1) { ["x-willy-info"]=> array(1) { [0]=> string(4) "test" } } :

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