PHP - 「雙向」遞歸array_diff_key（）

Question

我想在兩個多維數組上應用array_diff_key（）遞歸地並找出它們之間的區別。

，該功能將是 「雙向」 所以FOO（$ A，$ B）和FOO（$ B $ A）將產生相同的結果是很重要的。

我試過了什麼？說實話，我嘗試了太多東西（包括http://php.net/manual/en/function.array-diff-key.php的例子）並迷路了。

function superMatch($a1, $a2) { 

    foreach($a1 as $k => $v) { 
     $r[$k] = is_array($v) ? superMatch($a1[$k], $a2[$k]) : array_diff_key($a1, $a2); 
    } 

    return $r; 
} 

輸入：

$a = array('a' => 'a', 'b' => 'b', 'c' => array('d' => 'd', 'e' => 'e')); 
$a = array('a' => 'a', 'b' => 'b', 'c' => array('t' => 'd', 'e' => 'e')); 

預計輸出： 'T'

可有人請給我一個線索？

Answer 1

想要的作品雙向按鍵的遞歸差異

你的狀態，所以給你的輸入：

$a = array('a' => 'a', 'b' => 'b', 'c' => array('d' => 'd', 'e' => 'e')); 
$b = array('a' => 'a', 'b' => 'b', 'c' => array('t' => 'd', 'e' => 'e')); 

你應該得到的輸出：

$output = array('c'=>array('d'=>'d','t'=>'d')); 
//or 
$output = array('t'=>'d','d'=>'d'); 

下面的方法將返回的第一個版本的輸出。但是，你在你的問題中說，它應該只輸出t，這是沒有意義的，因爲它不可能雙向工作（因爲密鑰d也不匹配）。

/** return an array that contains keys that do not match between $array and $compare, checking recursively. 
* It's bi-directional so it doesn't matter which param is first 
* 
* @param $array an array to compare 
* @param $compare another array 
* 
* @return an array that contains keys that do not match between $array and $compare 
*/ 
function keyMatch($array,$compare){ 

$output = array(); 
foreach ($array as $key=>$value){ 
    if (!array_key_exists($key,$compare)){ 
     //keys don't match, so add to output array 
     $output[$key] = $value; 
    } else if (is_array($value)||is_array($compare[$key])){ 
     //there is a sub array to search, and the keys match in the parent array 
     $match = keyMatch($value,$compare[$key]); 
     if (count($match)>0){ 
      //if $match is empty, then there wasn't actually a match to add to $output 
      $output[$key] = $match; 
     } 
    } 
} 
//Literally just renaiming $array to $compare and $compare to $array 
// Why? because I copy-pasted the first foreach loop 
$compareCopy = $compare; 
$compare = $array; 
$array = $compareCopy; 
foreach ($array as $key=>$value){ 
    if (!array_key_exists($key,$compare)){ 
     $output[$key] = $value; 
    } else if (is_array($value)||is_array($compare[$key])){ 
     $match = keyMatch($value,$compare[$key]); 
     if (count($match)>0){ 
      $output[$key] = $match; 
     } 
    } 
} 
return $output; 

} 
$a = array('a' => 'a', 'b' => 'b', 'c' => array('d' => 'd', 'e' => 'e')); 
$b = array('a' => 'a', 'b' => 'b', 'c' => array('t' => 'd', 'e' => 'e')); 
print_r(keyMatch($a,$b)); 

噢，這是您的小例子輸入的example of it working。