Initial import

authenticate.php

@@ -0,0 +1,52 @@
+<?php
+// Start the session
+session_start();
+require_once('config.php');
+// Try and connect using the info above
+$con = mysqli_connect($DATABASE_HOST, $DATABASE_USER, $DATABASE_PASS, $DATABASE_NAME);
+// Check for connection errors
+if (mysqli_connect_errno()) {
+	// If there is an error with the connection, stop the script and display the error
+	exit('Failed to connect to MySQL: ' . mysqli_connect_error());
+}
+// Now we check if the data from the login form was submitted, isset() will check if the data exists
+if (!isset($_POST['username'], $_POST['password'])) {
+	// Could not get the data that should have been sent
+	exit('Please fill both the username and password fields!');
+}
+// Prepare our SQL, which will prevent SQL injection
+if ($stmt = $con->prepare('SELECT id, password FROM accounts WHERE username = ?')) {
+	// Bind parameters (s = string, i = int, b = blob, etc), in our case the username is a string so we use "s"
+	$stmt->bind_param('s', $_POST['username']);
+	$stmt->execute();
+	// Store the result so we can check if the account exists in the database
+	$stmt->store_result();
+    // Check if account exists with the input username
+    if ($stmt->num_rows > 0) {
+        // Account exists, so bind the results to variables
+        $stmt->bind_result($id, $password);
+        $stmt->fetch();
+        // Note: remember to use password_hash in your registration file to store the hashed passwords
+        if (password_verify($_POST['password'], $password)) {
+            // Password is correct! User has logged in!
+            // Regenerate the session ID to prevent session fixation attacks
+            session_regenerate_id();
+            // Declare session variables (they basically act like cookies but the data is remembered on the server)
+            $_SESSION['account_loggedin'] = TRUE;
+            $_SESSION['account_name'] = $_POST['username'];
+            $_SESSION['account_id'] = $id;
+            // Redirect to the home page
+            header('Location: home.php');
+            exit;
+        } else {
+            // Incorrect password
+            echo 'Incorrect username and/or password!';
+        }
+    } else {
+        // Incorrect username
+        echo 'Incorrect username and/or password!';
+    }
+    // Close the prepared statement
+	$stmt->close();
+}
+?>