68 lines
1.6 KiB
PHP
68 lines
1.6 KiB
PHP
<?php
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header('Content-Type: application/json');
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// Basic input validation and sanitization
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if (!isset($_POST['qid']) || empty($_POST['qid'])) {
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echo json_encode(['error' => 'Missing QID parameter']);
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exit;
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}
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$qid = $_POST['qid'];
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// Database connection (adjust credentials accordingly)
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//
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$config = require 'config.php';
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$host = $config['db_host'];
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$db = $config['db_name'];
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$user = $config['db_user'];
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$pass = $config['db_pass'];
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$charset = 'utf8mb4';
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$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
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$options = [
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PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
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PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
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];
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try {
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$pdo = new PDO($dsn, $user, $pass, $options);
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$sql = "
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SELECT value, COUNT(*) AS count
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FROM Answers
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WHERE QID = :qid
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AND value BETWEEN -3 AND 3
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GROUP BY value
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ORDER BY value
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";
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$stmt = $pdo->prepare($sql);
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$stmt->execute(['qid' => $qid]);
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$results = $stmt->fetchAll();
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// Initialize array with all possible values from -3 to 3 with zero counts
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$counts = [];
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for ($i = -3; $i <= 3; $i++) {
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$counts[$i] = 0;
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}
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// Fill in counts from query results
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foreach ($results as $row) {
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$counts[(int)$row['value']] = (int)$row['count'];
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}
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// Return as JSON array of objects [{value: -3, count: 5}, ...]
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$response = [];
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foreach ($counts as $value => $count) {
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$response[] = ['value' => $value, 'count' => $count];
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}
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echo json_encode($response);
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} catch (PDOException $e) {
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echo json_encode(['error' => 'Database error: ' . $e->getMessage()]);
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exit;
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}
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