Null-coalescing associative array elements example

example.php

<?php

function givesNull(): ?int {
    return null;
}

function shouldAdd(): bool {
    return false;
}

$nullValue = null;
$a = [
    'test1' ?=> 12312,
    'test2' ?=> $nullValue,
    'test3' ?=> givesNull(),
    'test4' ?=> "test string",
    'test5' ?=> null,
    'test7' ?=> shouldAdd() ? "added" : null,
    'test8' ?=> [
        'sub-key-1' ?=> 'test',
        'sub-key-2' ?=> givesNull(),
    ],
];

var_dump($a);

/*
Output:

array(3) {
  ["test1"]=>
  int(12312)
  ["test4"]=>
  string(11) "test string"
  ["test8"]=>
  array(1) {
    ["sub-key-1"]=>
    string(4) "test"
  }
}
*/