我输出一段JSON数据。输出结果为

[{"name":"\u53e4\u5854\u533a"},{"name":"\u51cc\u6cb3\u533a"},{"name":"\u592a\u548c\u533a"},{"name":"\u677e\u5c71\u65b0\u533a"},{"name":"\u5f00\u53d1\u533a"},{"name":"\u4e49\u53bf"},{"name":"\u9ed1\u5c71"},{"name":"\u51cc\u6d77"},{"name":"\u5317\u9547"}]

可是这不符合我的要求，，
我想的是下面这种。

["\u53e4\u5854\u533a","\u51cc\u6cb3\u533a","\u592a\u548c\u533a","\u677e\u5c71\u65b0\u533a","\u5f00\u53d1\u533a","\u4e49\u53bf","\u9ed1\u5c71","\u51cc\u6d77","\u5317\u9547"]


请问这样的JSON要怎么写代码？

echo json_encode($arr);