PHP数组合并两个数组具有相同价值

Question

我是新来的PHP，和我想下面的两个数组合并成一个阵列，匹配相同的编码值：

Array(1) 
(
    [0] => Array 
     (
      [0] => CODE11 
      [1] => NAME 
      [2] => ADDRESS 
     ) 
    [1] => Array 
     (
      [0] => CODE23 
      [1] => NAME 
      [2] => ADDRESS 
     ) 
    [2] => Array 
     (
      [0] => CODE25 
      [1] => NAME 
      [2] => ADDRESS 
     ) 
) 

和

Array(2) 
(
    [0] => Array 
     (
      [0] => CODE43 
      [1] => CITY 
      [2] => COUNTRY 
     ) 
    [1] => Array 
     (
      [0] => CODE25 
      [1] => CITY 
      [2] => COUNTRY 
     ) 
    [2] => Array 
     (
      [0] => CODE89 
      [1] => CITY 
      [2] => COUNTRY 
     ) 
) 

到这个新的数组：

Result 
(
    [0] => Array 
     (
      [0] => CODE25 
      [1] => NAME 
      [2] => ADDRESS 
      [3] => CITY 
      [4] => COUNTRY 
     ) 
) 

正如你所看到的，只有CODE25两个阵列上匹配。我如何解决它？

Answer 1

$hash = array(); 
// First create an associative array from $array1 using the CODE as the key 
foreach ($array1 as $el) { 
    $hash[$el[0]] = $el; 
} 
// Then append the data from $array2 to matching elements 
foreach ($array2 as $el) { 
    if (isset($hash[$el[0]])) { 
     $hash[$el[0]] = array_merge($hash[$el[0]], array_slice($el, 1)); 
    } 
} 
// Now find the elements that were matched and return them as an ordinary array 
$new_array = array_values(array_filter($hash, function($x) { return count($x) > 3; })); 

Answer 2

我们可以使用PHP函数，用更少的代码做到这一点，但不是这一点，因为你正在学习，让我们尝试一个非常基本的方法：

foreach ($array1 as $key1 => $value1) 
{ 
    foreach ($array2 as $key2 => $value2) 
    { 
     if ($value1[0] == $value2[0]) 
      $result[] = array(
       $value1[0], 
       $value1[1], 
       $value1[2], 
       $value2[1], 
       $value2[2] 
      ); 
    } 
} 

免责声明：这是不是一个非常有效的算法。但是对于短时间的数据（每个数字为$array1和$array2,<两个密钥），它将毫不费力地执行这个技巧。有关更多信息，请参阅Big O notation。