Question

很长一段时间不能解决smth看起来像非常简单的问题...我想合并一个二维数组。例子：

$arr1 = {
  [532] =
  {
    [0] = "11"
    [1] = "12"
  }
  [273] =
  {
    [0] = "99"
  }
}
$arr2 = {
  [532] =
  {
    [0] = "11"
    [1] = "13"
  }
}

合并的结果应该是，公共键上的映射，与该数组完全相同：

$result = {
  [532] =
  {
     [0] =
     {      
        [0] = "11"
        [1] = "12"
     }
     [1] =
     {
        [0] = "11"
        [1] = "13"
     }
  }
  [273]
     [0] =
     {      
        [0] = "99"
     }
     [1] =
     {

     }
}

我尝试这样的话：

    $result = $arr1;
    foreach ($arr2 as $key => $value) {
        $result[$key] = isset($result[$key]) ? array_merge([$result[$key]], [$value]) : [$value];
    }

但是如果$ arr2为空则它不起作用：（

Answer 1

可能是这样的

 $arr1 = {
      [532] =
      {
        [0] = "11"
        [1] = "12"
      }
      [273] =
      {
        [0] = "99"
      }
    }
    $arr2 = {
      [532] =
      {
        [0] = "11"
        [1] = "13"
      }
    }

   $newarray = array();
   foreach ($arr1 as $key => $value) {
      $cu = $arr1[$key];

      $newarray[$key][] = $cu;

      if(!isset($arr2[$key])) {
            $newarray[$key][] = array();
       }
       else {
         $newarray[$key][] = $arr2[$key];
       }
   }

foreach ($arr2 as $key => $value) {
          if(!isset($newarray[$key])) {
             $newarray[$key][] = $arr2[$key]; 
          }
       }

Answer 2

对于第二次数组检查，您需要使用array_merge()数组或不使用数组：

示例：

<?php $arr1 = array('532'=>array('11','12'),'273'=>array('99')); $arr2 = array('532'=>array('11','13')); $newArr = array(); foreach ($arr1 as $key => $value) { if(isset($arr2[$key])){ $newArr[$key][] = array_merge($value,$arr2[$key]); } else{ $newArr[$key] = $value; } } echo "<pre>"; print_r($newArr); ?>

<强>结果：

Array ( [532] => Array ( [0] => Array ( [0] => 11 [1] => 12 [2] => 11 [3] => 13 ) ) [273] => Array ( [0] => 99 ) )

此外，如果你想合并两个相同的索引，你可以使用template <int W> void bar();这样的东西：

#include <iostream> template <int T> class Testclass { public: void foo(void) { std::cout << T << std::endl; } template <int U> void bar(void) { std::cout << T << " " << U << std::endl; } }; template <int W> void bar(); template <int V> void testfunction( void ) { Testclass<V> otherTestObj; otherTestObj.foo(); otherTestObj.bar<4>(); } int main() { Testclass<1> testobject; testobject.foo(); testobject.bar<2>(); testfunction<3>(); return 0; }

<强>结果：

{{1}}

请注意， ist脚本，会根据您的需要为您提供唯一索引的结果。 第二个脚本将在一个数组中为您提供所有值。

在PHP中合并二维数组

2 个答案: