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.

If you just want to retrieve the item - stackoverflow.com/questions/33264853/… — Nigel Ren
– Nigel Ren, Commented Jan 8, 2021 at 16:28

O.M.N.L · Accepted Answer · 2021-01-08 16:45:50Z

0

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);

answered Jan 8, 2021 at 16:45

O.M.N.L

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