php数据有关问题， -PHP Tutorial-php.cn

php数据有关问题，

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Release： 2016-06-13 12:35:41

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php数据问题，请教高手！
有这样一个数组：

Array<br />
(<br />
    [0] => Array<br />
        (<br />
            [time] => 1382060855000<br />
            [day] => 2013-10-18<br />
            [latitude] => 39.9289<br />
            [longitude] => 116.3883<br />
        )<br />
<br />
    [1] => Array<br />
        (<br />
            [time] => 1382060855000<br />
            [day] => 2013-10-18<br />
            [latitude] => 42<br />
            [longitude] => 43.5<br />
        )<br />
<br />
    [2] => Array<br />
        (<br />
            [time] => 1382060855000<br />
            [day] => 2013-10-18<br />
            [latitude] => 38.9122<br />
            [longitude] => 121.6022<br />
        )<br />
<br />
    [3] => Array<br />
        (<br />
            [time] => 1382060855000<br />
            [day] => 2013-10-18<br />
            [latitude] => 40.5525<br />
            [longitude] => -74.2915<br />
        )<br />
<br />
    [4] => Array<br />
        (<br />
            [time] => 1382060855000<br />
            [day] => 2013-10-18<br />
            [latitude] => 40.5525<br />
            [longitude] => -74.2915<br />
        )<br />
<br />
    [5] => Array<br />
        (<br />
            [time] => 1382060855000<br />
            [day] => 2013-10-18<br />
            [latitude] => 38.9122<br />
            [longitude] => 121.6022<br />
        )<br />
<br />
    [6] => Array<br />
        (<br />
            [time] => 1382060855000<br />
            [day] => 2013-10-18<br />
            [latitude] => 38.9122<br />
            [longitude] => 121.6022<br />
        )<br />
)

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里面的经纬度有重复的数据，想过滤掉重复数据，并且得到每一个相同经纬度的数量。最后得到的数组如下：

这个要怎么实现呢？

php 数组