使用值将关联数组转换为多维数组

Question

这是一个有趣的情况,我创建了一个工作函数,但想知道我是否只有任何人有更简单的方法.

我有以下多维数组:

$foo = array(
    [0] => array(
        'keys' => array( 
            'key1' => 1,
            'key2' => a,
            'key3' => 123
        ),
       'values' => array(
            //goodies in here
        )
    )
    [1] => array(
        'keys' => array( 
            'key1' => 1,
            'key2' => b,
            'key3' => 456
        ),
       'values' => array(
            //goodies in here
        )
    )
)

我想,是转换成基于嵌套一个多维数组此值从keys阵列中,我一直在寻找的输出是:

$bar = array(
    [1] => array(
        [a] => array(
            [123] => array( //values array from above )
        ),
        [b] => array(
            [456] => array( //values array from above )
        )
    )
)

密钥总是可以根据它们在keys数组中的位置进行嵌套,但是它们的密钥并不总是相同,keys处理用户定义的分组,因此顺序和值可以更改.我也不想要重复的密钥.

array_merge失败了,因为在很多情况下,数组键实际上是数字ID.所以,这个功能有效 - 但我想知道我是不是给自己做了一副新手套.

   protected function convertAssociativeToMulti( &$output, $keys, $value )
   {
      $temp = array();
      $v = array_values( $keys );
      $s = sizeof( $v );
      for( $x = 0; $x < $s; $x++ )
      {
         $k = $v[ $x ];
         if ( $x == 0 )
         {
            if ( !array_key_exists( $k, $output ) )
               $output[ $k ] = array();
            $temp =& $output[ $k ];
         }
         if ( $x && ( $x + 1 ) !== $s )
         {
            if( !array_key_exists( $k, $temp ) )
               $temp[ $k ] = array();
            $temp =& $temp[$k];
         }
         if ( ( $x + 1 ) == $s )
            $temp[$k] = $value;
      }
   }

   $baz = array();
   foreach( $foo as $bar )
   {
      $this->convertAssociativeToMulti( $baz, $bar['keys'], $bar['values'] );
   }

那么,你如何更简单地/重构我所拥有的呢？

Answer 1

这更简洁一些：

$result = [];
foreach($foo as $item)
{
    //Start at the outermost level of the result array
    $level = &$result;
    foreach($item['keys'] as $key)
    {
        //Add levels to the result array as needed
        if(!isset($level[$key])) $level[$key] = [];
        //Iterate to the next nested level
        $level = &$level[$key];
    }
    //Append values to the innermost level
    foreach($item['values'] as $k => $v) $level[$k] = $v;
}
//Don't keep a reference hanging around
unset($level);
var_dump($result);