$arr_headers=[
		'dat' => 'Дата/время',
		'pId' => 'Вебмастер',
		'click' => 'Визиты',
		'uniq_click' => 'Уникальные',
		'registrations' => 'Регистрации',
	];

    [1] => Array
        (
            [dat] => 23.03.2017
            [click] => 1
            [uniq_click] => 0
            [registrations] => 0
            [pId] => p_00001
        )

    [2] => Array
        (
            [dat] => 22.03.2017
            [click] => 5
            [uniq_click] => 2
            [registrations] => 0
            [pId] => p_00001
        )

$allowed = array_keys($h_array); 
foreach($data as $arr){
	uksort($arr, function($a, $b) use ($allowed) { 
		return array_search($a, $allowed) - array_search($b, $allowed); 
	});
        $adata[]=$arr;
}