php通过其键访问多维数组的特定位置并进行设置

Question

In PHP we can do things like these:

Class Example {
 ...
}
$example = 'Example';
$object = new $example();

Or the use of variable variables:

$hour = 18;
$greets = array('Good morning','Good afternoon','Good evening');
$values = array(13,21,23);//people is sleeping at 23PM, so they don't greet.
$n = count($values);
$greet = 'greets';
for($i=0;$i<$n;$i++){
   if($hour < $values[$i]){
       echo 'hello, '.${$greet}[$i];
       break;
   }
}

And others..

I wonder if it would be possible to access directly to a specific index of a multidimensional array in a similar way. Something like:

$array = array(...); //multidimensional array.
$position = '[0][4][3]';
print_r($array$position);

Thanks in advance.

---

UPDATE

I'm so sorry because I finished my question in a wrong way.

I need to set the multimesional array and add a value. i.e:

$array$position = $data;

Answer 1

Nope, this is not possible. The only thing you can do is to implement ArrayAccess interface, which allows to access instances with [] operator. But you will have to define the logic yourself.

class MyClass implements ArrayAccess
{
...
}

$x = new MyClass([0=>[4=>[3=>'hello world']]]);
$position = '[0][4][3]';
echo $x[$position]; //hello world