function findMissingNumber($arr) {
$n = count($arr) + 1;
$total = ($n * ($n + 1)) / 2;
$sum = array_sum($arr);
return $total - $sum;
}
// Example usage:
$array = [1, 2, 4, 5, 6];
echo "Missing number: " . findMissingNumber($array);
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