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function secondHighest(array $arr) {
sort($arr);
echo $arr[sizeof($arr)-2];
}
secondHighest(array( 4, 9, 5, 2, 8, 0, 3, 22));
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<?php
$arr = [1, 5, 40, 20, 30];
// Sort the array in descending order
rsort($arr);
// Check if there is a second largest element
if (count($arr) >= 2) {
$second_largest = $arr[1];
echo 'Second largest element is ' . $second_largest;
} else {
echo 'Array does not have a second largest element';
}