php教程二维数组合并与元素值相加实例
*/
$arr_click = array(
    array('date' => '2010-10-01', 'click' =>'1'),
    array('date' => '2010-10-02', 'click' =>'2'),
    array('date' => '2010-10-02', 'click' =>'3'),
    array('date' => '2010-10-03', 'click' =>'4'),
);

$temp = array();

foreach ($arr_click as $k => $v)
{
    $key = $v['date'];
    $temp[$key] = isset($temp[$key]) ? $v['click'] + $temp[$key] : $v['click'];
}

foreach ($temp as $k => $v)
{
    $result[] = array('date' => $k, 'click' => $v);
}

var_dump($result);

//方法二

$arr_click = array(
array( 'date' => '2010-10-01', 'click' =>'1' ),
array( 'date' => '2010-10-02', 'click' =>'2' ),
array( 'date' => '2010-10-02', 'click' =>'3' ),
array( 'date' => '2010-10-03', 'click' =>'4' ),
);
foreach($arr_click as $v)
  if($r[$v['date']]) $r[$v['date']]['click'] += $v['click'];
  else $r[$v['date']] = $v;
$arr_click = array_values($r);

print_r($arr_click);

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