api添加item_sku_extends出错

'sku_stocks' => '[{"price":1700,"quantity":23,"skus":[{"k":"甜度","kid":642703,"v":"3分","vid":606356},{"k":"净含量","kid":497,"v":"10g","vid":2569},{"k":"预定","kid":4970,"v":"只要现货","vid":11111}]},]',

'item_sku_extends' => '[{"cost_price":800,"s1":606356,"s2":2569,"s3":11111,"s4":0,"s5":0}]',

哪里不对呢，提示错误，谢谢

array(1) {  ["error_response"]=>  array(2) {    ["msg"]=>    string(38) "参数不正确: sku扩展参数错误"    ["code"]=>    int(121010100)  }}

正确参考如下：
sku_stocks：新接口重新组装成一个大JSON，传入一定要按照这个格式：
[ { "price":10000, "quantity":100, "item_no":"ATC-002", "skus":[ { "k":"颜色", "kid":1, "v":"绿色", "vid":1217 }, { "k":"尺寸", "kid":2, "v":"l", "vid":1367 }, { "k":"内存", "kid":41, "v":"1024G", "vid":303435 } ] }, { "price":10000, "quantity":100, "item_no":"ATC-002", "skus":[ { "k":"颜色", "kid":1, "v":"绿色", "vid":1217 }, { "k":"尺寸", "kid":2, "v":"l", "vid":1367 }, { "k":"内存", "kid":41, "v":"16G", "vid":6356 } ] } ]
注意：sku_stocks数量=规格1数量 * 规格2数量 * 规格3数量；
商品sku扩展信息，组装成一个JSON,与sku_stocks参数匹配。如上面传入的sku_stocks，则s1为颜色对应的vid，传入一定要按照这个格式 [ { "cost_price":2000, //成本价 "s1":1217,规格层级1对应的规格属性ID "s2":1367, "s3":303435, "s4":0, "s5":0 }, { "cost_price":2000, "s1":1217, "s2":1367, "s3":6356, "s4":0, "s5":0 } ]
详情参考文档：https://open.youzan.com/v3/apice ... /youzan.item.update