在PHP中逐字段添加多维数组的最优雅方法是什么？

问题描述：

I'm trying to add up two multidimensional arrays, both equally sized, field by field. I.e.:

$sum[4][3] = $a[4][3] + $b[4][3];

Or:

$a = array( array(1, 4), array(3, 2));
$b = array( array(9, 2), array(1, 0));

Should result in:

$sum = array( array(10, 6), array(4, 2));

Is there a more elegant way than foreaching over all the arrays?

我正在尝试按字段添加两个大小相同的多维数组。即： p>

  $ sum [4] [3] = $ a [4] [3] + $ b [4] [3]; 
  code>  
 
 或者： p> 
 
 
  $ a = array（array（1,4），array（3,2））; 
 $ b  = array（array（9,2），array（1,0））; 
  code>  pre> 
 
 应该导致： p> 
 
 
   $ sum = array（array（10,6），array（4,2））; 
  code>  pre> 
 
 是否有比foreed更优雅的方式 数组？ p> 
  div>

答

You can use the function array_map() This applies a function to each of the elements in an array ($a in your case) and applies a callback function to those, you can give extra arguments to those functions by supplying another array ($b in your case). The result will be $sum of your example.

The callback function would need to check if the arguments are arrays, if so it would need to do the mapping function again (so its a recursive function) if the arguments aren't an array it needs to add the function.

http://nl3.php.net/manual/en/function.array-map.php

So all in all you'd be off much better doing a nested foreach :)

在PHP中逐字段添加多维数组的最优雅方法是什么？

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