PHP根据json中的一个键值排序的

{
    "data":[
            {"roleId":"qai41","role":"qai43","level":"45","sex":"0"},
            {"roleId":"qai41","role":"qai41","level":"78","sex":"0"},
            {"roleId":"qai41","role":"qai42","level":"44","sex":"0"}

          ]
}

怎么取出level最大的role?

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