获取json数据所有的节点路径

	
	function iterTree($data) {

	    $retData = array();

	    $data = json_decode($data, true);

	    if (!is_array($data) && empty($data)) {

	        echo 'error !' . "\n"; 

	    } else {

	        $queue = array();

	        foreach ($data as $field => $value) {

	            $queue[] = $field; 

	        }       

	        $head = 0;

	        $tail = count($queue);

	        while ($head < $tail) {

	            $field = $queue[$head++];

	            $path = explode("/", $field);

	            $tmpData = &$data; 

	            foreach ($path as $key => $ph) {

	                $tmpData = &$tmpData[$ph];

	            }       

	            if (is_array($tmpData) && !empty($tmpData)) {

	                $newField = $field; 

	                foreach ($tmpData as $curField => $curValue) {

	                    $newField = $field . '/' . $curField;

	                    $queue[$tail++] = $newField;

	                }       

	            } else {

	                $retData[] = $field; 

	            }       

	        }       

	    }

	    return $retData;

	}

	//测试数据

	$data = file_get_contents("http://restapi.ele.me/v1/restaurants?extras%5B%5D=food_activity&extras%5B%5D=restaurant_activity&extras%5B%5D=certification&fields%5B%5D=id&fields%5B%5D=name&fiel

	ds%5B%5D=phone&fields%5B%5D=promotion_info&fields%5B%5D=name_for_url&fields%5B%5D=flavors&fields%5B%5D=is_time_ensure&fields%5B%5D=is_premium&fields%5B%5D=image_path&fields%5B%5D=rating&fie

	lds%5B%5D=is_free_delivery&fields%5B%5D=minimum_order_amount&fields%5B%5D=order_lead_time&fields%5B%5D=is_support_invoice&fields%5B%5D=is_new&fields%5B%5D=is_third_party_delivery&fields%5B%

	5D=is_in_book_time&fields%5B%5D=rating_count&fields%5B%5D=address&fields%5B%5D=month_sales&fields%5B%5D=delivery_fee&fields%5B%5D=minimum_free_delivery_amount&fields%5B%5D=minimum_order_des

	cription&fields%5B%5D=minimum_invoice_amount&fields%5B%5D=opening_hours&fields%5B%5D=is_online_payment&fields%5B%5D=status&fields%5B%5D=supports&fields%5B%5D=in_delivery_area&geohash=wx4g07

	j0w1v7&is_premium=0&limit=1000&offset=24&type=geohash");

	$ret = iterTree($data);

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