PHP Selecting unknown depth of array

Question

I'm going to try to make this as simple as possible. A dot notation string gets sent to a function, so for example, this would be the string.

'user.id' 

Then I explode the dot to give me an array of names

$dotNotation = explode(".", $variable);

And now I need to use these names to select from another variable like so

$row[$dotNotation[0]][$dotNotation[1]]

So this would be

$row['user']['id']

However, I need it to be dynamic, it can be any depth i.e there can be any number of dots. I'm totally stuck on how to achieve this.

Answer 1

You could just iterate through all the keys and retrieve the value:

function getDotNotationValue($dotNotation, $row) {
   $dotNotationArray = explode(".", $dotNotation);
   foreach($dotNotationArray as $key) {
      $row = $row[$key];
   }
   return $row;
}

$row = ["test1" => ["test2" => ["test3" => "value"]]];
$string = "test1.test2.test3";
echo getDotNotationValue($string, $row);