求大侠讲解json字符串处理方案，谢谢

<?php
$string='{
    "fenxiao_products_ge_response": {
        "total_results": 10,
        "products": {
            "fenxiao_product": [{
                "pid": 1255,
                "name": "jayzhou",
                "productcat_id": 444,
                "standard_price": "5",
                "cost_price": "5",
                "retail_price_low": "10.56",
                "retail_price_high": "10.56",
                "outer_id": 4444,
                "quantity": 444,
                "alarm_number": 444,
                "pictures": "http://img01.taobaocdn.com/xxx.jpg,http://img01.taobaocdn.com/xxx.jpg",
                "desc_path": "http://img03.taobaocdn.com/xxx.dpc",
                "prov": "浙江",
                "city": "杭州",
                "postage_type": "12",
                "postage_id": 5545,
                "postage_ordinary": "10.56",
                "postage_fast": "10.56",
                "postage_ems": "12.2",
                "have_invoice": true,
                "have_guarantee": true,
                "status": "up",
                "items_count": 5,
                "orders_count": 5,
                "created": "2000-01-01 00:00:00",
                "modified": "2000-01-01 00:00:00",
                "skus": {
                    "fenxiao_sku": [{
                        "id": "jayzhou",
                        "name": "如鞋子的sku：“红色，35”",
                        "cost_price": "1",
                        "quantity": "1",
                        "outer_id": "1"
                    }]
                }
            }]
        }
    }
}
';
$array=(array)json_decode($string,true);
var_dump($array);
?>
求解 json_decode()函数无法处理该json字符串求各位大侠赐教 小弟万分感谢 ！