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<?php $testArray = array('test' => array('a' => array('percy', 'a' => 'mitch'), 'b' => array('test', 'hello'), 'c')); $res = array_merge(array_column($testArray, 'a'), array_column($testArray, 'b'), array('x' => array('ex'),'y' => 'why','z' => 'zee')); print_r($res);

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