35109-vm/db/config.php

<?php
// db/config.php

function db_connect() {
    static $pdo;
    if ($pdo) {
        return $pdo;
    }

    // Database credentials - DO NOT MODIFY
    $host = '127.0.0.1';
    $dbname = 'app';
    $user = 'app';
    $pass = 'app';
    $port = 3306;
    $charset = 'utf8mb4';

    $dsn = "mysql:host=$host;port=$port;dbname=$dbname;charset=$charset";
    $options = [
        PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
        PDO::ATTR_EMULATE_PREPARES   => false,
    ];

    try {
        $pdo = new PDO($dsn, $user, $pass, $options);
        return $pdo;
    } catch (PDOException $e) {
        // In a real app, log this error and show a generic message
        throw new PDOException($e->getMessage(), (int)$e->getCode());
    }
}

function run_migrations() {
    $pdo = db_connect();
    $migrationsDir = __DIR__ . '/migrations';
    if (!is_dir($migrationsDir)) {
        mkdir($migrationsDir, 0775, true);
    }

    $migrationFiles = glob($migrationsDir . '/*.sql');
    sort($migrationFiles);

    foreach ($migrationFiles as $file) {
        try {
            $sql = file_get_contents($file);
            if (!empty(trim($sql))) {
                $pdo->exec($sql);
            }
        } catch (PDOException $e) {
            // Log error, handle failure
            error_log("Migration failed for file $file: " . $e->getMessage());
        }
    }
}

// Run migrations automatically on include
run_migrations();

// Helper function for easy access
function db() {
    return db_connect();
}