0206.php

<?php
// echo phpinfo();
// declare (strict_types = 1);

ini_set('display_errors', 1); // Enable displaying errors in the browser
// // ini_set('display_startup_errors', 1); // Display errors on startup
error_reporting(E_ALL); // Report all errors (including notices)

function dummyFn($n): int
{
    return "100"; //enbling string_type gives error
}
$value = dummyFn([1, 2, 3, 4, 5]);
var_dump($value);

$param = null;

$param ??= 120;
// this prints 120 but if we define $param as 20 then it gives 20 though we assigned it to 120 later on
var_dump($param);

$namedfn = function (int $n) use ($param) {
    return $n + $param;
};
echo $namedfn(5);

$output = fn($n) => $n + $param;
echo $output(20);

$dummyAry = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
function simpleFn(...$values)
{
    var_dump(...$values);
    return array_sum($values);
}
echo simpleFn(...$dummyAry);

function simpleFn2(...$allargu)
{
    var_dump($allargu);
}
echo simpleFn2(10, $dummyAry, 'string', 4.5, 22);