declare(strict_types=1);
/**
* Finds the two largest elements in an array.
*
* @param array<int> $numbers Input array of integers.
*
* @return array{
* largest:int,
* secondLargest:int
* }
*
* @throws InvalidArgumentException If the array contains fewer than 2 elements.
*/
function findTwoLargest(array $numbers): array
{
if (count($numbers) < 2) {
throw new InvalidArgumentException(
'Array must contain at least two elements.'
);
}
$largest = PHP_INT_MIN;
$secondLargest = PHP_INT_MIN;
foreach ($numbers as $value) {
if ($value > $largest) {
$secondLargest = $largest;
$largest = $value;
} elseif ($value > $secondLargest) {
$secondLargest = $value;
}
}
return [
'largest' => $largest,
'secondLargest' => $secondLargest,
];
}
// Input data
$numbers = [3, 4, 9, 6, 7, 1, 2, 5];
// Find the two largest elements
$result = findTwoLargest($numbers);
// Display results
echo 'Array: ' . implode(', ', $numbers) . PHP_EOL;
echo 'Largest element: ' . $result['largest'] . PHP_EOL;
echo 'Second largest element: ' . $result['secondLargest'] . PHP_EOL;
/*
run:
Array: 3, 4, 9, 6, 7, 1, 2, 5
Largest element: 9
Second largest element: 7
*/
