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<?php $blah= array(array('a'=> 1, 'b' => array('inner' => 2))); function _test(&$test) { foreach ($test as $key => $value) { if (is_array($value) === false) continue; $clone = array(); $clone = array_merge($clone, $test); unset($clone[$key]['a']); if (is_array($value) === true){ _test($test[$key]); } } } _test($blah); var_dump($blah);

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