php数据有关问题，

php数据问题，请教高手！
有这样一个数组：


这个要怎么实现呢？                                                  php                    数组                                              
[解决办法]
$ar = array (
  0 =&gt; 
  array (
    'time' =&gt; '1382060855000',
    'day' =&gt; '2013-10-18',
    'latitude' =&gt; '39.9289',
    'longitude' =&gt; '116.3883',
  ),
  1 =&gt; 
  array (
    'time' =&gt; '1382060855000',
    'day' =&gt; '2013-10-18',
    'latitude' =&gt; '42',
    'longitude' =&gt; '43.5',
  ),
  2 =&gt; 
  array (
    'time' =&gt; '1382060855000', 
 
    'day' =&gt; '2013-10-18',
    'latitude' =&gt; '38.9122',
    'longitude' =&gt; '121.6022',
  ),
  3 =&gt; 
  array (
    'time' =&gt; '1382060855000',
    'day' =&gt; '2013-10-18',
    'latitude' =&gt; '40.5525',
    'longitude' =&gt; '-74.2915',
  ),
  4 =&gt; 
  array (
    'time' =&gt; '1382060855000',
    'day' =&gt; '2013-10-18',
    'latitude' =&gt; '40.5525',
    'longitude' =&gt; '-74.2915',
  ),
  5 =&gt; 
  array (
    'time' =&gt; '1382060855000',
    'day' =&gt; '2013-10-18',
    'latitude' =&gt; '38.9122',
    'longitude' =&gt; '121.6022',
  ),
  6 =&gt; 
  array (
    'time' =&gt; '1382060855000',
    'day' =&gt; '2013-10-18',
    'latitude' =&gt; '38.9122',
    'longitude' =&gt; '121.6022',
  ),
);
$res = array();
foreach($ar as $v) {
  $k = $v['latitude'] . ',' . $v['longitude'];
  if(isset($res[$k])) $res[$k]['count']++;
  else $res[$k] = array('latitude' =&gt; $v['latitude'], 'longitude' =&gt; $v['longitude'], 'count' =&gt; 1);
}
print_r(array_values($res));

Array
(
    [0] =&gt; Array
        (
            [latitude] =&gt; 39.9289
            [longitude] =&gt; 116.3883
            [count] =&gt; 1
        )

    [1] =&gt; Array
        (
            [latitude] =&gt; 42
            [longitude] =&gt; 43.5
            [count] =&gt; 1
        )

    [2] =&gt; Array
        (
            [latitude] =&gt; 38.9122
            [longitude] =&gt; 121.6022
            [count] =&gt; 3
        )

    [3] =&gt; Array
        (
            [latitude] =&gt; 40.5525
            [longitude] =&gt; -74.2915
            [count] =&gt; 2
        )

)
php数据有关问题

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