Are numeric and associative arrays in PHP two different things?

Question

This is a deeper dive into a previous question I had here: Can items in PHP associative arrays not be accessed numerically (i.e. by index)?

According to W3Schools, :

Answer 1

You get an associative array. Try this code:

$myArray[0] = 'value1';
$myArray['one'] = 'value2';

echo($myArray[1]);

See? It doesn't echo anything.