二维数组排序这个要怎么做？
array
(
    [0] => array
        (
            [userid] => 123707
            [username] => qycntest
            [realname] => 企业开发
            [sex] => 3
            [departname] => 
        )
[1] => array
        (
            [userid] => 123725
            [username] => devtest-23
            [realname] => nn
            [sex] => 1
            [departname] => 17c
            [creator] => 1
        )
[2] => array
        (
            [userid] => 123726
            [username] => devtest-24
            [realname] => oo
            [sex] => 1
            [departname] => 测试部
            [ismanager] => 1
        )
[3] => array
        (
            [userid] => 123728
            [username] => devtest-26
            [realname] => qq
            [sex] => 1
            [departname] => 测试部
            [ismanager] => 1
        )
[4] => array
        (
            [userid] => 123732
            [username] => devtest-30
            [realname] => uu
            [sex] => 1
            [departname] => 测试部
        )
)
我要把有iscreator的项的排在最前面，其次是ismanager=1排在后面，最后就是普通用户，请教下大家！ 谢谢
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