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Build PHP auto-login as a separate “remember me” feature: keep the regular PHP session cookie non-persistent, issue a cryptographically random persistent token, store only its hash on the server, and rotate it whenever it is used. Never store a password in a cookie or extend the session ID into a long-lived login credential.

How PHP auto-login should work

A persistent login cookie is a bearer credential: anyone who obtains it may be able to access the account. PHP’s session guidance therefore recommends a secure auto-login key and says to use it only once, generating a replacement after each successful automatic login. PHP: Session Security Management

  1. Authenticate normally. Serve the login page and all authentication-related traffic over HTTPS. Verify the submitted password against its stored password hash with password_verify(). PHP: password_verify
  2. Regenerate the session ID. After credentials are accepted, call session_regenerate_id(true) or use the framework’s equivalent. This prevents an attacker from fixing a known pre-login session ID and having it become authenticated. PHP: session_regenerate_id OWASP Session Management Cheat Sheet
  3. If “remember me” was selected, issue a separate token. Create it with PHP’s random_bytes(), save a hash of the token along with the account ID, creation time, expiry and, if useful, device metadata, and send the raw token in a persistent cookie. Do not save the raw token in the database. PHP: Session Security Management
  4. On a later request without an authenticated session, validate and rotate. Find the token record, check that it has not expired or been revoked, and compare the presented token with its stored hash using a timing-safe comparison. If valid, consume or revoke that token, issue a replacement, and establish a fresh PHP session with a newly generated session ID. Never accept the same auto-login key a second time.
  5. On logout, remove both kinds of authentication. Destroy the PHP session, expire the browser cookie using the same path and cookie scope with which it was set, and revoke its server-side token record. Revoke outstanding remember-me tokens after a password change, account recovery or suspected compromise.
  6. Protect actions that change data. Use CSRF tokens for state-changing requests. SameSite cookie behavior adds protection but does not replace CSRF defenses.

Keep the session cookie separate from “remember me”

PHP documents session.cookie_lifetime=0 as keeping the ordinary session cookie valid until the browser is closed. Use that short-lived session cookie for an active session; let the separate remember-me token restore authentication when needed. Avoid making a PHP session ID permanent: it is the active session credential, not a safely managed persistent-login token. PHP: Session Security INI Settings

Cookie and session safeguards

OWASP’s PHP Configuration Cheat Sheet lists the following hardened baseline settings. Adapt them to the application and deployment rather than treating them as universally correct defaults. OWASP PHP Configuration Cheat Sheet

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  • session.use_strict_mode=1
  • session.use_only_cookies=1
  • session.cookie_secure=1 so cookies are sent only over HTTPS
  • session.cookie_httponly=1 so browser scripts cannot read the cookie
  • session.cookie_samesite=Strict where that policy fits the site’s cross-site navigation and login needs

Set the remember-me cookie itself with Secure, HttpOnly, an appropriately narrow Path, and a suitable SameSite value. The Secure flag depends on HTTPS, so ensure the entire login and authenticated experience uses HTTPS. SameSite settings and browser cookie behavior can affect cross-site flows; choose deliberately and test the application’s actual login and navigation paths.

Design token expiry, revocation and recovery

Store enough server-side information to enforce the token’s lifetime and revoke it independently of the user’s current PHP session. A token record can include an account ID, token hash, creation and expiry timestamps, and optional device metadata. Set an expiry appropriate to the application’s risk and user needs; the PHP guidance establishes the need to protect and rotate auto-login keys, but does not prescribe a universal duration.

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Provide a way to disable auto-login and remove the persistent cookie. Keep token revocation available for logout, password changes, account recovery and suspected compromise. If users can manage remembered devices, device metadata can help identify which token to revoke without exposing the token itself.

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Common unsafe shortcuts

  • Password in a cookie: Never store a plaintext password, or a reusable password credential, in a cookie. Use password verification for the initial login and a separate random token for persistence.
  • Permanent PHP session ID: Do not extend the standard session cookie’s lifetime to implement remember-me. Session IDs should be regenerated after authentication, while persistent login uses its own one-time token.
  • Reusable token: Do not leave a remember-me token valid after it has authenticated a request. Consume it and rotate to make replay of a stolen token harder.
  • SameSite as the only CSRF control: SameSite is defense in depth; use CSRF tokens for state-changing requests.

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