MCPInstall

auth0-php

Use when adding session-based login, logout, or user profile to a PHP web application. Integrates auth0/auth0-php — use even if the user says "add login to my PHP app".

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254
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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/auth0/agent-skills --skill auth0-php
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads auth0-php automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Auth0 PHP Web App Integration

Add login, logout, and user profile to a PHP web application using auth0/auth0-php.


Prerequisites

  • PHP 8.2+ with extensions: mbstring, openssl, json
  • Composer installed
  • Auth0 Regular Web Application configured (not an API - must be an Application)
  • If you don't have Auth0 set up yet, use the auth0-quickstart skill first

When NOT to Use

  • PHP APIs with JWT Bearer validation - Use auth0-php-api for stateless API token validation
  • Laravel applications - Use a dedicated Laravel integration with auth0/laravel-auth0
  • Symfony applications - Use a dedicated Symfony integration with auth0/symfony
  • Single Page Applications - Use auth0-react, auth0-vue, or auth0-angular for client-side auth
  • Next.js applications - Use auth0-nextjs which handles both client and server
  • Node.js web apps - Use auth0-express or auth0-fastify for session-based auth

Quick Start Workflow

1. Install SDK

composer require auth0/auth0-php vlucas/phpdotenv guzzlehttp/guzzle guzzlehttp/psr7
  • auth0/auth0-php - The Auth0 SDK
  • vlucas/phpdotenv - Load .env files into $_ENV
  • guzzlehttp/guzzle + guzzlehttp/psr7 - PSR-18 HTTP client required by the SDK

2. Configure Environment

Create .env:

AUTH0_DOMAIN=your-tenant.us.auth0.com
AUTH0_CLIENT_ID=your_client_id
AUTH0_CLIENT_SECRET=your_client_secret
AUTH0_COOKIE_SECRET=your_generated_secret
AUTH0_REDIRECT_URI=http://localhost:3000/callback

AUTH0_DOMAIN is your Auth0 tenant domain (without https://). AUTH0_CLIENT_ID and AUTH0_CLIENT_SECRET come from your Auth0 Application settings. AUTH0_COOKIE_SECRET is used for encrypting session cookies - generate with openssl rand -hex 32.

3. Configure Auth0 Dashboard

In your Auth0 Application settings:

  • Application Type: Regular Web Application
  • Allowed Callback URLs: http://localhost:3000/callback
  • Allowed Logout URLs: http://localhost:3000

4. Create Auth Configuration

Create auth0.php to initialize the SDK:

<?php

require 'vendor/autoload.php';

use Auth0\SDK\Auth0;
use Auth0\SDK\Configuration\SdkConfiguration;

// Load environment variables
$dotenv = Dotenv\Dotenv::createImmutable(__DIR__);
$dotenv->load();

$configuration = new SdkConfiguration(
    strategy: SdkConfiguration::STRATEGY_REGULAR,
    domain: $_ENV['AUTH0_DOMAIN'],
    clientId: $_ENV['AUTH0_CLIENT_ID'],
    clientSecret: $_ENV['AUTH0_CLIENT_SECRET'],
    cookieSecret: $_ENV['AUTH0_COOKIE_SECRET'],
    redirectUri: $_ENV['AUTH0_REDIRECT_URI'],
    scope: ['openid', 'profile', 'email'],
);

$auth0 = new Auth0($configuration);

Create one Auth0 instance and reuse it. Never hardcode credentials - always use environment variables.

How this works: The SDK encrypts session data (tokens, user profile) using AES-256-GCM with a key derived from cookieSecret via HKDF-SHA256. Session data is stored in an encrypted cookie by default - no server-side database required.

5. Create Index Page (Router)

Create index.php as a simple front controller. Create the routes/ directory first:

<?php

$path = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);

if ($path === '/style.css') {
    header('Content-Type: text/css');
    readfile(__DIR__ . '/style.css');
    exit;
}

require 'auth0.php';

switch ($path) {
    case '/':
        require 'routes/home.php';
        break;
    case '/login':
        require 'routes/login.php';
        break;
    case '/callback':
        require 'routes/callback.php';
        break;
    case '/profile':
        require 'routes/profile.php';
        break;
    case '/logout':
        require 'routes/logout.php';
        break;
    default:
        http_response_code(404);
        echo 'Not found';
        break;
}

The static file handler for /style.css is placed before require 'auth0.php' so stylesheets load without initializing the SDK.

6. Add Stylesheet

Create style.css:

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: #f5f7fa;
    color: #1a1a2e;
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

.card {
    background: #fff;
    border-radius: 12px;
    padding: 28px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    border: 1px solid #e8ecf0;
}

.card.center {
    text-align: center;
    padding: 60px 28px;
}

h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 4px;
}

h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
    color: #444;
}

.subtitle {
    color: #666;
    font-size: 0.95rem;
}

.card.center .subtitle {
    margin: 12px 0 28px;
}

.user-header {
    display: flex;
    align-items: center;
    gap: 16px;
}

.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
}

.avatar-lg {
    width: 72px;
    height: 72px;
}

.nav-links {
    margin-top: 20px;
    display: flex;
    gap: 12px;
}

.top-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.15s ease;
}

.btn-primary {
    background: #635bff;
    color: #fff;
}

.btn-primary:hover {
    background: #4b44d4;
}

.btn-secondary {
    background: #f0f0f5;
    color: #444;
}

.btn-secondary:hover {
    background: #e4e4ec;
}

.btn-back {
    background: none;
    color: #635bff;
    padding: 10px 0;
}

.btn-back:hover {
    color: #4b44d4;
}

.info-table {
    width: 100%;
    border-collapse: collapse;
}

.info-table tr {
    border-bottom: 1px solid #f0f0f5;
}

.info-table tr:last-child {
    border-bottom: none;
}

.info-table td {
    padding: 10px 0;
    vertical-align: top;
}

.info-table .label {
    font-weight: 500;
    color: #666;
    width: 160px;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.info-table .value {
    color: #1a1a2e;
    word-break: break-all;
}

.token-box {
    background: #f8f9fb;
    border: 1px solid #e8ecf0;
    border-radius: 8px;
    padding: 14px;
    font-size: 0.8rem;
    font-family: 'SF Mono', Monaco, 'Cascadia Code', monospace;
    word-break: break-all;
    white-space: pre-wrap;
    max-height: 120px;
    overflow-y: auto;
    margin-bottom: 16px;
}

7. Add Home Route

Create routes/home.php:

<?php

$credentials = $auth0->getCredentials();
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Auth0 PHP App</title>
    <link rel="stylesheet" href="/style.css">
</head>
<body>
    <div class="container">
        <?php if ($credentials): ?>
            <div class="card">
                <div class="user-header">
                    <img src="<?= htmlspecialchars($credentials->user['picture'] ?? '') ?>" alt="avatar" class="avatar" />
                    <div>
                        <h1>Hello, <?= htmlspecialchars($credentials->user['name'] ?? 'User') ?>!</h1>
                        <p class="subtitle"><?= htmlspecialchars($credentials->user['email'] ?? '') ?></p>
                    </div>
                </div>
                <nav class="nav-links">
                    <a href="/profile" class="btn btn-primary">View Profile & Tokens</a>
                    <a href="/logout" class="btn btn-secondary">Logout</a>
                </nav>
            </div>
        <?php else: ?>
            <div class="card center">
                <h1>Auth0 PHP Web App</h1>
                <p class="subtitle">Session-based authentication with Auth0 SDK</p>
                <a href="/login" class="btn btn-primary">Login</a>
            </div>
        <?php endif; ?>
    </div>
</body>
</html>

8. Add Login Route

Create routes/login.php:

<?php

header('Location: ' . $auth0->login());
exit;

login() returns a URL string pointing to Auth0's Universal Login page. You must redirect the user to it.

9. Add Callback Route

Create routes/callback.php:

<?php

if (null !== $auth0->getExchangeParameters()) {
    try {
        $auth0->exchange();
        header('Location: /');
        exit;
    } catch (\Exception $e) {
        error_log('Auth0 callback error: ' . $e->getMessage());
        http_response_code(400);
        echo "Authentication failed. Please try again.";
        exit;
    }
}

header('Location: /');
exit;

getExchangeParameters() checks if the callback contains authorization code parameters. exchange() exchanges the code for tokens and establishes the session. Always wrap in try/catch since the token exchange can fail (e.g. expired code, CSRF mismatch).

10. Add Profile Route (Protected)

Create routes/profile.php:

<?php

$credentials = $auth0->getCredentials();

if (null === $credentials) {
    header('Location: /login');
    exit;
}

$user = $credentials->user;
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Profile - Auth0 PHP App</title>
    <link rel="stylesheet" href="/style.css">
</head>
<body>
    <div class="container">
        <nav class="top-nav">
            <a href="/" class="btn btn-back">&larr; Back to Home</a>
            <a href="/logout" class="btn btn-secondary">Logout</a>
        </nav>

        <div class="card">
            <div class="user-header">
                <img src="<?= htmlspecialchars($user['picture'] ?? '') ?>" alt="avatar" class="avatar avatar-lg" />
                <div>
                    <h1><?= htmlspecialchars($user['name'] ?? 'User') ?></h1>
                    <p class="subtitle"><?= htmlspecialchars($user['email'] ?? '') ?></p>
                </div>
            </div>
        </div>

        <div class="card">
            <h2>User Profile Claims</h2>
            <table class="info-table">
                <?php foreach ($user as $key => $value): ?>
                <tr>
                    <td class="label"><?= htmlspecialchars($key) ?></td>
                    <td class="value"><?= htmlspecialchars(is_array($value) ? json_encode($value) : (string)$value) ?></td>
                </tr>
                <?php endforeach; ?>
            </table>
        </div>

        <div class="card">
            <h2>ID Token</h2>
            <pre class="token-box"><?= htmlspecialchars($credentials->idToken ?? 'N/A') ?></pre>
        </div>

        <div class="card">
            <h2>Access Token</h2>
            <pre class="token-box"><?= htmlspecialchars($credentials->accessToken ?? 'N/A') ?></pre>
            <table class="info-table">
                <tr>
                    <td class="label">Expires</td>
                    <td class="value"><?= $credentials->accessTokenExpiration ? date('Y-m-d H:i:s', $credentials->accessTokenExpiration) . ' (' . ($credentials->accessTokenExpired ? 'EXPIRED' : 'valid') . ')' : 'N/A' ?></td>
                </tr>
                <tr>
                    <td class="label">Scopes</td>
                    <td class="value"><?= htmlspecialchars(implode(', ', $credentials->accessTokenScope ?? [])) ?></td>
                </tr>
            </table>
        </div>

        <?php if ($credentials->refreshToken): ?>
        <div class="card">
            <h2>Refresh Token</h2>
            <pre class="token-box"><?= htmlspecialchars($credentials->refreshToken) ?></pre>
        </div>
        <?php endif; ?>
    </div>
</body>
</html>

getCredentials() returns the user's session data, or null if not logged in. The profile page displays all user claims and tokens for verification during development.

11. Add Logout Route

Create routes/logout.php:

<?php

header('Location: ' . $auth0->logout(returnUri: 'http://localhost:3000'));
exit;

logout() returns the Auth0 logout URL. Redirect the user to it. The returnUri is where Auth0 sends the user after logout - it must be listed in Allowed Logout URLs. In production, replace with your actual domain.

12. Test the App

php -S localhost:3000 index.php

Visit http://localhost:3000/login to start the login flow.


Common Mistakes

MistakeFix
Hardcoding domain, clientId, or clientSecret in sourceAlways read from environment variables - never embed credentials in code
Using an old auth0-PHP version < 8.0Require PHP 8.2+ and v8.x of the SDK; older versions have different APIs
Installing without a PSR-18 HTTP clientMust have a PSR-18 client (e.g. guzzlehttp/guzzle) or the SDK cannot make HTTP requests
Using STRATEGY_API for a web appWeb apps must use SdkConfiguration::STRATEGY_REGULAR for session-based auth
Passing domain as full URL with https://domain should be the bare domain, e.g. my-tenant.us.auth0.com, not https://my-tenant.us.auth0.com
Forgetting cookieSecretRequired for session encryption - without it, the SDK throws a ConfigurationException
Not checking getExchangeParameters() before exchange()Calling exchange() without parameters causes errors; always check first
Not handling errors in callbackexchange() can fail - always wrap in try/catch
Created app as SPA type in Auth0Must be Regular Web Application type for server-side auth
Not configuring callback URL in Auth0 DashboardMust add http://localhost:3000/callback to Allowed Callback URLs
Using $_SESSION directlyThe SDK manages its own encrypted cookie session - do not use $_SESSION unless you configure a custom SessionStore
Deploying without cookieSecure: trueMust set to true in production - cookies are sent over HTTP otherwise
Calling login() or logout() without redirectingBoth return URL strings, not responses - must use header('Location: ...')
"Network error resulted in unfulfilled request" on callbackUsually means AUTH0_CLIENT_SECRET is wrong, not an actual network issue - verify your credentials in .env

Key SDK Methods

MethodSignaturePurpose
login$auth0->login(?string $redirectUrl, ?array $params): stringReturns authorization URL string - redirect user to it
exchange$auth0->exchange(?string $redirectUri, ?string $code, ?string $state): boolExchanges authorization code for tokens, establishes session
getCredentials$auth0->getCredentials(): ?objectReturns current session credentials or null
getExchangeParameters$auth0->getExchangeParameters(): ?objectChecks if callback contains exchange parameters
logout$auth0->logout(?string $returnUri, ?array $params): stringReturns Auth0 logout URL string
renew$auth0->renew(?array $params): selfRefreshes expired access token (requires offline_access scope)
clear$auth0->clear(bool $transient = true): selfClears local session without Auth0 logout

Credentials Object

After successful authentication, getCredentials() returns an object with:

$credentials = $auth0->getCredentials();

$credentials->user;                    // array - user profile claims
$credentials->idToken;                 // string - raw ID token
$credentials->accessToken;             // string - access token
$credentials->refreshToken;            // string|null - refresh token (requires offline_access)
$credentials->accessTokenExpiration;   // int - expiration timestamp
$credentials->accessTokenExpired;      // bool - whether token is expired
$credentials->accessTokenScope;        // array - granted scopes

User profile claims ($credentials->user):

  • sub - unique user identifier
  • name, nickname, picture
  • email, email_verified
  • given_name, family_name
  • updated_at, locale

Related Skills

  • auth0-php-api - For protecting PHP APIs with JWT Bearer token validation
  • auth0-quickstart - Basic Auth0 setup and framework detection
  • auth0-cli - Manage Auth0 resources from the terminal
  • auth0-mfa - Add Multi-Factor Authentication

Quick Reference

SdkConfiguration for web apps:

$configuration = new SdkConfiguration(
    strategy: SdkConfiguration::STRATEGY_REGULAR,        // required
    domain: $_ENV['AUTH0_DOMAIN'],                        // required
    clientId: $_ENV['AUTH0_CLIENT_ID'],                   // required
    clientSecret: $_ENV['AUTH0_CLIENT_SECRET'],           // required
    cookieSecret: $_ENV['AUTH0_COOKIE_SECRET'],           // required
    redirectUri: $_ENV['AUTH0_REDIRECT_URI'],             // required
    scope: ['openid', 'profile', 'email'],               // recommended
);

Route protection pattern:

$credentials = $auth0->getCredentials();
if (null === $credentials) {
    header('Location: /login');
    exit;
}

Environment variables:

  • AUTH0_DOMAIN - your Auth0 tenant domain (e.g. tenant.us.auth0.com)
  • AUTH0_CLIENT_ID - your Application's client ID
  • AUTH0_CLIENT_SECRET - your Application's client secret
  • AUTH0_COOKIE_SECRET - encryption secret key (generate: openssl rand -hex 32)
  • AUTH0_REDIRECT_URI - callback URL (e.g. http://localhost:3000/callback)

Detailed Documentation

  • Setup Guide - Automated setup scripts, environment configuration, Auth0 CLI usage
  • Integration Guide - Protected routes, calling APIs, session management, error handling
  • API Reference - Complete Auth0 SDK API, configuration options, session storage, security

References

FAQ

What does the auth0-php skill do?

Use when adding session-based login, logout, or user profile to a PHP web application. Integrates auth0/auth0-php — use even if the user says "add login to my PHP app".

How do I install auth0-php?

Run npx skills add https://github.com/auth0/agent-skills --skill auth0-php in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/auth0-php/ (personal) or .claude/skills/auth0-php/ (project).

Which AI agents can use auth0-php?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is auth0-php safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains auth0-php?

It is published by auth0 in auth0/agent-skills, and it is an official skill from the maker of the technology it covers. It has 254 recorded installs.

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