55. System punktacji uczniów

{
  "students": [
    {
      "id": 1,
      "name": "Jan Kowalski",
      "class": "3TI",
      "points": [
        {"amount": 5, "reason": "Odpowiedź na lekcji", "date": "2026-02-10"},
        {"amount": 10, "reason": "Projekt tygodnia", "date": "2026-02-14"}
      ]
    }
  ]
}

<?php
// Obliczanie sumy punktów ucznia
function getTotalPoints(array $student): int {
    return array_sum(array_column($student['points'], 'amount'));
}

// Budowanie rankingu
function buildRanking(array $students): array {
    $ranked = array_map(function($s) {
        $s['total'] = getTotalPoints($s);
        return $s;
    }, $students);

    usort($ranked, fn($a, $b) => $b['total'] <=> $a['total']);

    foreach ($ranked as $i => &$s) {
        $s['rank'] = $i + 1;
    }
    return $ranked;
}

// Przyznawanie punktów
function addPoints(array &$students, int $studentId, int $amount, string $reason): bool {
    foreach ($students as &$student) {
        if ($student['id'] === $studentId) {
            $student['points'][] = [
                'amount' => $amount,
                'reason' => htmlspecialchars($reason),
                'date' => date('Y-m-d'),
            ];
            return true;
        }
    }
    return false;
}