$arr = array(
array(
'imp' => 1000,
'clk' => 100,
'date' => 20150601
),
array(
'imp' => 1002,
'clk' => 102,
'date' => 20150602
),
array(
'imp' => 1003,
'clk' => 103,
'date' => 20150601
)
);
求这个数组里相同日期的曝光总和、点击总和，用最简洁的代码表示出来
imp 曝光
clk 点击
date 日期
回复内容：
$arr = array(
array(
'imp' => 1000,
'clk' => 100,
'date' => 20150601
),
array(
'imp' => 1002,
'clk' => 102,
'date' => 20150602
),
array(
'imp' => 1003,
'clk' => 103,
'date' => 20150601
)
);
求这个数组里相同日期的曝光总和、点击总和，用最简洁的代码表示出来
imp 曝光
clk 点击
date 日期
php$a=array();
foreach($arr as $v){
$a[$v['date']]['clk']+=$v['clk'];
$a[$v['date']]['imp']+=$v['imp'];
}
print_r($a);
php$res=[];
foreach ($arr as $key => $value) {
$res[$value['date']] =array(
'imp' =>isset($res[$value['date']]) ? $res[$value['date']]['imp']+$value['imp'] : $value['imp'],
'clk' =>isset($res[$value['date']]) ? $res[$value['date']]['clk']+$value['clk'] : $value['clk'],
'date' =>$value['date']
);
}
print_r(array_values($res));
Array
(
[0] => Array
(
[imp] => 2003
[clk] => 203
[date] => 20150601
)
[1] => Array
(
[imp] => 1002
[clk] => 102
[date] => 20150602
)
)
$tmp = array();
foreach($arr as $k => $v) {
$tmp[$k] = $v['date'];
}
$tmp = array_unique($tmp);
/* 去重后得
Array
(
[0] => 20150601
[1] => 20150602
)
*/
$tmp2 = array();
foreach($tmp as $k => $v) {
$tmp2[$v]['imp'] = 0;
$tmp2[$v]['clk'] = 0;
}
/* 初始化得
Array
(
[20150601] => Array
(
[imp] => 0
[clk] => 0
)
[20150602] => Array
(
[imp] => 0
[clk] => 0
)
)
*/
foreach($tmp as $k => $v) {
foreach($arr as $k2 => $v2) {
if($v == $v2['date']) {
$tmp2[$v]['imp'] += $v2['imp'];
$tmp2[$v]['clk'] += $v2['clk'];
}
}
}
print_r($tmp2);
/* 求和得
Array
(
[20150601] => Array
(
[imp] => 2003
[clk] => 203
)
[20150602] => Array
(
[imp] => 1002
[clk] => 102
)
)
*/
来个reduce版本
1000,
'clk' => 100,
'date' => 20150601
),
array(
'imp' => 1002,
'clk' => 102,
'date' => 20150602
),
array(
'imp' => 1003,
'clk' => 103,
'date' => 20150601
)
);
$result = array_reduce($arr, function($left, $right) {
if(isset($right['imp'])) $left['imp'] += $right['imp'];
if(isset($right['clk'])) $left['clk'] += $right['clk'];
return $left;
}, [
'imp' => 0,
'clk' => 0
]);
print_r($result);
http://3v4l.org/58v94
专业问题。。学习了
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