Add array data by name php

I’m new to arrays. I’d like to know if you can add data to the array by name.
This would be an example of what I want to achieve

example:

$guitars = ['names',['Warvick', 'Gibson', 'Fender']];
$guitars[names][] = "Ibanez";
echo "<pre>";
var_dump($guitars);
echo "</pre>";

result

WARNING Use of undefined constant names - assumed 'names' (this will throw an Error in a future version of PHP) on line number 3
array(3) {
  [0]=>
  string(5) "names"
  [1]=>
  array(3) {
    [0]=>
    string(7) "Warvick"
    [1]=>
    string(6) "Gibson"
    [2]=>
    string(6) "Fender"
  }
  ["names"]=>
  array(1) {
    [0]=>
    string(6) "Ibanez"
  }

what I want is to add the data "ibanez" to the array "names" but nevertheless create a new one.

I need it to stay this way. Is there any way to access the data directly by the name "names"?

array(2) {
  [0]=>
  string(5) "names"
  [1]=>
  array(4) {
    [0]=>
    string(7) "Warvick"
    [1]=>
    string(6) "Gibson"
    [2]=>
    string(6) "Fender"
    [3]=>
    string(6) "Ibanez"
  }
}

>Solution :

You want to use associative arrays. In this case, for example, use the arrow token to associate the guitar names with the "names" key.

$guitars = ['names' => ['Warvick', 'Gibson', 'Fender']];
$guitars['names'][] = "Ibanez";
echo "<pre>";
var_dump($guitars);
echo "</pre>";