Commit inicial con archivos existentes

includes/activity_logger.php

@@ -0,0 +1,35 @@
+<?php
+require_once __DIR__ . '/db.php';
+
+function log_activity(int $userId, string $action, ?string $details = null): void
+{
+    global $pdo;
+
+    // Debugging: Check if $pdo is a valid PDO object
+    if (!($pdo instanceof PDO)) {
+        error_log("Error logging activity: $pdo is not a valid PDO object. Type: " . gettype($pdo));
+        return;
+    }
+
+    try {
+        // Fetch username from session or database if not available
+        $username = $_SESSION['username'] ?? 'Unknown';
+        if ($username === 'Unknown' && $userId > 0) {
+            $stmt = $pdo->prepare("SELECT username FROM users WHERE id = ?");
+            $stmt->execute([$userId]);
+            $user = $stmt->fetch(PDO::FETCH_ASSOC);
+            if ($user) {
+                $username = $user['username'];
+            }
+        }
+
+        $stmt = $pdo->prepare(
+            "INSERT INTO activity_log (user_id, username, action, details, timestamp)
+             VALUES (?, ?, ?, ?, NOW())"
+        );
+        $stmt->execute([$userId, $username, $action, $details]);
+    } catch (PDOException $e) {
+        error_log("Error logging activity: " . $e->getMessage());
+    }
+}
+?>