合并2D php数组的元素

Question

我有一个看起来像这样的2d PHP数组。

Array
(
    [0] => Array
        (
            [year] => 1990
            [Hydro] => 17071.0288392
            [Coal] => 
        )
    [1] => Array
        (
            [year] => 2000
            [Hydro] => 6708.00288392
            [Coal] =>
        )
    [2] => Array
        (
            [year] => 1990
            [Hydro] => 
            [Coal] => 17071.0288392
        )
    [3] => Array
        (
            [year] => 2000
            [Hydro] => 
            [Coal] => 2100.0288392
        )
)

有没有办法根据年份键的值合并元素，所以我会得到这样的东西 预期结果

Array
(
    [0] => Array
        (
            [year] => 1990
            [Hydro] => 17071.0288392
            [Coal] => 17071.0288392
        )

    [1] => Array
        (
            [year] => 2000
            [Hydro] => 6708.00288392
            [Coal] => 2100.0288392
        )

)

非常感谢你！

Answer 1

<?php

   $arrNew = array();

   foreach ($arrCurr as $arr) {
     $arrTemp = array();

     for ($i=1; $i < count($arr); $i++) {
       $arrTemp[] = $arr[$i];
     }

     $arrNew[$arr['year']][] = $arrTemp;

   }

   print_r($arrNew);

?>