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、

Question

array (size=2)

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)
      
      
      ![图片描述][2]