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foreach(array_keys($array) as $key0) {	//Main cat stuff	$array[str_replace(' ', '_', $key0)] = $array[$key0];	unset($array[$key0]);	$key0 = str_replace(' ', '_', $key0);	foreach(array_keys($array[$key0]) as $key1) {		//sub cat stuff		$array[$key0][str_replace(' ', '_', $key1)] = $array[$key0][$key1];		unset($array[$key0][$key1]);	}}