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WordPress normally keeps users signed in with authentication cookies, not PHP sessions. The browser stores a cookie value and sends it with matching requests; WordPress verifies that value to identify the user. A PHP session keeps the actual state on the server and gives the browser only a session identifier. For ordinary WordPress login, use the built-in cookie system. Add a custom PHP session only when your plugin genuinely needs temporary, server-side state that WordPress authentication does not provide.
What WordPress cookies do
A cookie is a small value stored by the browser and attached automatically to requests that match its domain, path, security and same-site rules. WordPress uses cookies to verify identity, maintain login state and remember selected preferences. The value is held on the client, so anyone who obtains a valid authentication cookie may be able to replay it as the user until it expires or the server invalidates it.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteWordPress authentication cookies are created by the normal login flow. The principal cookies are:
| Cookie | Typical scope | Purpose |
|---|---|---|
wordpress_[hash] |
Administration area | Authenticates access to the WordPress dashboard. |
wordpress_logged_in_[hash] |
Front end | Lets WordPress recognize a logged-in visitor outside the dashboard. |
wordpress_sec_[hash] |
Secure HTTPS login | Used for authentication when secure login cookies are enabled. |
| Settings cookies | Administration and user preferences | Remember interface choices and other customization settings. |
| Comment cookies | Comment forms | Remember details a commenter has entered so they do not need to retype them. |
| Language cookies | Localized interfaces | Remember a language or locale selection where the installation supports it. |
| Test cookies | Capability checks | Help WordPress determine whether the browser accepts cookies. |
The exact hash in an authentication-cookie name varies by site configuration. Do not write plugin logic that assumes one fixed hash or that treats a cookie name alone as proof of identity; WordPress must validate the complete value.
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Cookies and PHP sessions: the fundamental difference
Both mechanisms can maintain state across requests, but they place that state in different locations and have different operational consequences.
| Concern | WordPress authentication cookie | Custom PHP session |
|---|---|---|
| Where state lives | The browser holds an authentication value that WordPress validates. | The server holds session data; the browser normally holds only an identifier. |
| Framework integration | Built into WordPress login, user APIs, capabilities and nonce handling. | Must be started, read and ended by your plugin or application code. |
| Lifetime | Uses WordPress authentication expiration rules, including the Remember Me choice. | You define idle and absolute expiration and any renewal policy. |
| Invalidation | WordPress can invalidate authentication on logout and other account events. | Your server-side store must remove or revoke the session record. |
| CSRF protection | State-changing REST requests made with cookie authentication require a WordPress REST nonce. | You must add an appropriate CSRF defense to every state-changing endpoint that relies on the session cookie. |
| Caching | Responses that vary by login cookie must not be served from an unauthenticated full-page cache. | Session-dependent pages have the same cache problem and can create more cache variation. |
| Horizontal scaling | WordPress can validate its authentication cookies on multiple web servers when they share the relevant site configuration. | Multiple servers need a shared session store or carefully managed affinity; local file sessions alone can fail when requests move between servers. |
| If a bearer value is stolen | An attacker may use the cookie until it expires or is invalidated. | An attacker may use the session identifier until the server-side session expires or is revoked. |
A PHP session is not automatically more secure than a WordPress cookie. Keeping sensitive state on the server limits what is exposed in the browser, but the identifier remains a bearer credential. Strong transport security, cookie attributes, rotation and server-side invalidation are required either way.
How long WordPress login cookies last
Under the default WordPress authentication settings documented for current login guidance, a normal login cookie expires after two days, or 48 hours. Selecting Remember Me makes the cookie persistent for 14 days. These are default durations, not a promise that every site uses those exact values: administrators, plugins or hosting policy may change authentication behavior.
| Login choice | Default persistence | What the browser does |
|---|---|---|
| Remember Me not selected | Two days (48 hours) | WordPress creates a browser-session authentication cookie subject to the normal two-day authentication expiration. |
| Remember Me selected | Fourteen days | WordPress creates a persistent cookie intended to survive closing and reopening the browser. |
Expiration is only one control. A server can invalidate a credential before its scheduled expiry, and a user can lose the cookie by clearing browser data or changing browser profiles. Conversely, deleting a cookie in one browser does not revoke a copied value held elsewhere.
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Use the supported WordPress API for authentication
When a plugin needs to sign a user in, use the documented function rather than constructing authentication cookies yourself:
wp_set_auth_cookie( $user_id, $remember, $secure );$user_id identifies the account. $remember is a Boolean corresponding to the persistent Remember Me behavior. $secure indicates whether the cookie should be restricted to secure HTTPS transport. Let WordPress create and validate the complete set of authentication cookies so that core login, logout, capability checks and nonce verification remain consistent.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe older wp_setcookie() API has been deprecated since WordPress 2.5.0. New code should not call it or imitate its historical behavior. If a login form, single-sign-on bridge or custom endpoint needs to authenticate a user, complete the user validation first, then call the supported authentication API and redirect only after the cookies have been sent successfully.
Secure cookie and session design
Authentication state should be treated as a credential, not as harmless preference data. Apply these controls to WordPress cookies and to any custom session identifier:
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- Use HTTPS for the entire authenticated flow. Do not allow a login or authenticated request to fall back to cleartext HTTP. Set the
Secureattribute so the browser sends the identifier only over HTTPS. - Set
HttpOnlywhen JavaScript does not need the value. This prevents ordinary page scripts from reading the identifier and reduces the impact of script-based theft. It does not stop an attacker from using a value already stolen by another route. - Choose an appropriate
SameSitepolicy.Laxis a practical default for many sites andStrictis more restrictive when the user experience permits it. SameSite is defense in depth, not a replacement for CSRF tokens. - Regenerate identifiers after authentication and privilege changes. Rotation limits session-fixation attacks in which an attacker tries to make a victim use an identifier known to the attacker.
- Keep secrets out of unsigned client cookies. Do not store passwords, API keys, authorization decisions or sensitive personal data directly in a value that the client can read or replay. Store sensitive state server-side, or use a well-designed integrity-protected token with a narrowly defined purpose.
- Invalidate on logout and high-risk events. Remove or revoke the server-side session and rotate relevant authentication state after password changes, account recovery, suspected theft or privilege changes. Clearing a browser cookie alone cannot invalidate a copied identifier.
- Protect cookie scope. Use the narrowest practical domain and path, and avoid making a sensitive cookie available to unrelated applications on the same host.
When a custom PHP session is justified
WordPress authentication already answers the question “which user is this?” A custom session is useful when a plugin needs temporary server-side state that is not an account identity: for example, a multi-step workflow, a short-lived checkout draft, a rate-limit record or a wizard that must survive several requests without placing its contents in the browser.
Do not call session_start() casually in a theme or plugin. Starting a session after output has begun can fail to send headers, and starting one on every request can interfere with full-page caching and create unnecessary state. First decide whether a user meta field, a transient, a signed one-time token or another WordPress-native mechanism meets the requirement with less complexity.
If a PHP session is genuinely required, use an explicit lifecycle:
- Start before output. Initialize the session at a predictable early hook or entry point, before WordPress or the theme sends any response body. Coordinate this with the hosting stack and any reverse proxy.
- Configure the session cookie. Set
Secure,HttpOnlyand an appropriateSameSitevalue. Give the cookie a narrow path and avoid exposing it to applications that do not need it. - Use a server-side store. Keep the actual workflow or account-related state on the server. On more than one web server, use a shared session backend or another design that guarantees every request can find the same record.
- Rotate the identifier. Regenerate it immediately after login, elevation of privileges or any transition where an anonymous workflow becomes associated with an account.
- Define expiration. Choose idle and absolute limits appropriate to the data, and remove abandoned records so the store does not grow indefinitely.
- Validate every read. Check ownership, expected state transitions, expiration and authorization on the server. A session identifier proves possession, not permission to perform every operation.
- Destroy on logout or revocation. Delete the server-side record and expire the browser cookie. Repeat the invalidation after password changes or other high-risk events.
A minimal conceptual flow looks like this:
start_session_before_output();
rotate_identifier_after_login();
$_SESSION['workflow_id'] = $server_side_record_id;
validate_owner_and_expiration($_SESSION['workflow_id']);
remove_server_side_record_on_logout();
expire_session_cookie_on_logout();The function names in this example describe responsibilities rather than a drop-in WordPress API. Implement them with the session and storage facilities appropriate to your hosting environment, and test behavior through your cache, proxy and load-balancer layers.
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Why the WordPress REST API needs a nonce when you are logged in
Cookie authentication happens automatically during the ordinary WordPress login flow. A browser then attaches the login cookie to matching REST requests. Because another site could try to make that browser send a request, WordPress requires a REST nonce for cookie-authenticated REST operations. The nonce is commonly sent in the X-WP-Nonce header or as the _wpnonce parameter.
A request with a login cookie but without a valid REST nonce is treated as unauthenticated for this purpose. The nonce proves that the request came through a page or script that received the site’s expected anti-CSRF value; it does not grant capabilities and does not replace authorization checks.
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fetch('/wp-json/example/v1/item', {
method: 'POST',
headers: {
'X-WP-Nonce': wpApiSettings.nonce,
'Content-Type': 'application/json'
},
body: JSON.stringify({ title: 'Example' })
});The endpoint must still verify the current user’s capabilities, validate and sanitize input, enforce object ownership where applicable, and return an appropriate error when authorization fails. A nonce is a CSRF defense, not an alternative login token and not a reason to skip current_user_can() or equivalent checks.
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Cookies, sessions and page caching
Full-page caches work best when the same response can be served to many visitors. A response that changes according to a login or session cookie cannot safely be reused for everyone. Exclude login pages, authenticated pages and cookie-varying responses from public caching; WordPress login guidance specifically calls out wp-login.php and cookie-based sessions when configuring server caches.
Common symptoms of a cache mistake include a logged-in user seeing a logged-out page, one user seeing another user’s personalized response, a login redirect loop, or a REST request receiving stale data. Purge the affected cache, inspect cache-control and vary rules, and verify that the cache key distinguishes every cookie that changes the response. Do not “fix” a privacy problem by exposing more cookie contents to JavaScript.
Choosing the right mechanism
| Need | Prefer | Reason |
|---|---|---|
| Identify a WordPress user across normal page loads | WordPress authentication cookies | They integrate with core login, capabilities, logout and REST nonce checks. |
| Remember a non-sensitive display preference | A narrowly scoped preference cookie | The browser can supply the value without creating server-side session state. |
| Hold sensitive, temporary, multi-request state | A server-side session or WordPress-native server-side store | The browser carries only an identifier, while the data remains under server control. |
| Authenticate an API request from a logged-in browser | WordPress cookie authentication plus a REST nonce | The cookie identifies the session and the nonce mitigates CSRF; capability checks remain mandatory. |
| Share state across several web servers | WordPress’s normal authentication or a shared session backend | Local-only session files can disappear when the next request reaches another server. |
Troubleshooting checklist
- The user is logged in but appears logged out: check HTTPS consistency, the cookie domain and path, clock or expiry issues, cache exclusions and whether a proxy is rewriting secure headers.
- A custom session is empty on the next request: confirm that the session started before output, that the browser accepted the cookie, that the identifier is returned on the next request and that every server can reach the same session store.
- REST returns an authentication or nonce error: send the current nonce in
X-WP-Nonceor_wpnonce, ensure the request includes the browser’s login cookie, and check that the page has not been cached with an outdated nonce. - Logout did not stop a suspicious request: revoke the server-side session or authentication state as well as deleting the local browser cookie, then rotate credentials after the security event.
- Headers-already-sent warnings appear: find output emitted before cookie or session initialization, including whitespace, debug messages and template output. Move initialization earlier and keep session startup out of requests that do not need it.
Bottom line
Use WordPress authentication cookies for WordPress identity: they are the supported, integrated mechanism, with a default two-day authentication expiration and a 14-day Remember Me persistence. Use PHP sessions only for a specific server-side state requirement, and then design the complete lifecycle—HTTPS, secure cookie attributes, identifier rotation, expiration, shared storage, CSRF protection, cache exclusions and server-side invalidation. A cookie or session identifier is a bearer credential, so possession must never be treated as proof that every requested action is authorized.
