如何將多維數組轉換爲單維數組？

Question

我想打開（在PHP）像

(["a"] => (
    ["x"] => "foo", 
    ["y"] => "bar"), 
["b"] => "moo", 
["c"] => (
    ["w"] => (
     ["z"] => "cow") 
     ) 
) 

到

(["a.x"] => "foo", 
["a.y"] => "bar", 
["b"] => "moo", 
["c.w.z"] => "cow") 

如何做到這一點？

Answer 1

您可以創建一個遞歸函數：

function flatten($arr, &$out, $prefix='') { 
    $prefix = $prefix ? $prefix . '.' : ''; 
    foreach($arr as $k => $value) { 
     $key = $prefix . $k; 
     if(is_array($value)) { 
      flatten($value, $out, $key); 
     } 
     else { 
      $out[$key] = $value; 
     } 
    } 
} 

你可以使用它作爲

$out = array(); 
flatten($array, $out); 

Answer 2

你來到這裏的東西很好：http://davidwalsh.name/flatten-nested-arrays-php