php把三维数组中在第二层的条件下，把第三层的有相同字段的合并成一个，把其中一个字段的值相加-PHP中文网问答

php把三维数组中在第二层的条件下，把第三层的有相同字段的合并成一个，把其中一个字段的值相加!

2 =>

array (size=4)
0 =>

array (size=5)
  'id' => string '1' (length=1)
  'username' => string 'ppp' (length=3)
  'pid' => string '2' (length=1)
  'turns' => string '100' (length=3)
  'use_time' => string '20161227' (length=8)

1 =>

array (size=5)
  'id' => string '2' (length=1)
  'username' => string 'ppp' (length=3)
  'pid' => string '2' (length=1)
  'turns' => string '68' (length=2)
  'use_time' => string '20161228' (length=8)

2 =>

array (size=5)
  'id' => string '5' (length=1)
  'username' => string 'ppp' (length=3)
  'pid' => string '2' (length=1)
  'turns' => string '10' (length=2)
  'use_time' => string '20161227' (length=8)

3 =>

array (size=5)
  'id' => string '6' (length=1)
  'username' => string 'ppp' (length=3)
  'pid' => string '2' (length=1)
  'turns' => string '20' (length=2)
  'use_time' => string '20161226' (length=8)

1 =>

array (size=1)
0 =>

array (size=5)
  'id' => string '7' (length=1)
  'username' => string 'ppp' (length=3)
  'pid' => string '1' (length=1)
  'turns' => string '30' (length=2)
  'use_time' => string '20161227' (length=8)

$arr=[ 2=>[ ['id'=>1,'user_time'=>'20161228','pid'=>2,'turns'=>1], ['id'=>2,'user_time'=>'20161227','pid'=>2,'turns'=>1], ['id'=>3,'user_time'=>'20161228','pid'=>2,'turns'=>10], ], 1=>[ ['id'=>1,'user_time'=>'20161228','pid'=>1,'turns'=>10], ['id'=>2,'user_time'=>'20161227','pid'=>1,'turns'=>1], ['id'=>3,'user_time'=>'20161227','pid'=>1,'turns'=>10], ], ]; $result=[]; foreach($arr as $k=>$v){ $res=[]; foreach($v as $key=>$value){ if(isset($res[$value['user_time']])){ $res[$value['user_time']]['turns']+=$value['turns']; }else{ $res[$value['user_time']]=$value; } } $result[$k]=array_values($res); } print_r($result); [ 2 => [ [ "id" => 1, "user_time" => "20161228", "pid" => 2, "turns" => 11 ], [ "id" => 2, "user_time" => "20161227", "pid" => 2, "turns" => 1 ] ], 1 => [ [ "id" => 1, "user_time" => "20161228", "pid" => 1, "turns" => 10 ], [ "id" => 2, "user_time" => "20161227", "pid" => 1, "turns" => 11 ] ] ]