<?php

function test($params) {
	extract($params);
	unset($params);
	var_dump($a, $b, $c, $d ?? '');
	echo '=========================' . PHP_EOL;
}

$a = 1;
$b = 'b';
$c = 12.35;
$data = [
	'a' => $a,
	'b' => $b,
	'c' => $c
];

test($data);

$d = [1, 2, 3];
$data['d'] = $d;

test($data);