动态获取/设置多维数组中的值的函数

Every item is stored as a subarray. I have a function, which checks if a given item exists in the basket array and returns the path to it. For example, if I want to check for a product with id 98 (CD-Rom), the function returns the following path: 1:extras:1.

如果我想在数组中获取或设置一个值，我无法弄清楚如何使用路径.是否可以在不使用 eval() 的情况下构造数组键的路径?我有这些功能:

I cant figure out how to use the path if I want to get or a set a value in the array. Is it possible to construct the path to an array key, without the use of eval()? I have these functions:

 function get_val($array, $path, $key) {
    //some code
    return eval('return '.$array.$path.$key.';');
 }

所以，$price = get_val($_SESSION['basket'], $path, 'price');应该返回 CD-ROM 的价格 (19.99)

So, $price = get_val($_SESSION['basket'], $path, 'price'); should return the price for CD-ROM (19.99)

 function set_val($array, $path, $key, $value) {
    //some code
    $str =  eval(''.$array.$path.$key.';');
    $str = $value;
 }

set_val($_SESSION['basket'], $path, 'price', '30'); 将 CD-ROM 的价格设置为 30.

set_val($_SESSION['basket'], $path, 'price', '30'); will set the price for CD-ROM to 30.

有没有更好的方法来做到这一点?

Is there a better way for doing this?

谢谢.

推荐答案

这是我前段时间微调的代码:

Here you go a code I have finetuned some time ago:

  function get_val($array,$path) {
    for($i=$array; $key=array_shift($path); $i=$i[$key]) {
      if(!isset($i[$key])) return null;
    }
    return $i;
  }

  function set_val(&$array,$path,$val) {
    for($i=&$array; $key=array_shift($path); $i=&$i[$key]) {
      if(!isset($i[$key])) $i[$key] = array();
    }
    $i = $val;
  }

看到这个测试示例，我相信这就是你要找的:

See this test example, I believe it is what you are looking for:

  $data = array("x"=>array("y"=>array("z"=>"foo")));
  echo get_val($data,array("x","y","z")); // foo
  set_val($data,array("x","y","u"),"bar"); // $data["x"]["y"]["u"] = "bar";

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