Enabling Session for Captcha in ThinkPHP6 to Prevent Verification Failure
To correctly use the Captcha feature in ThinkPHP6, you must manually enable the framework’s built‑in session support, as it is disabled by default; the Captcha stores its code in the session, and without an active session verification will always fail.
When using the Captcha component in ThinkPHP6 (tp6) for login verification, developers often encounter a “captcha verification failed” error.
The cause is that tp6 does not start a session automatically; the session feature is disabled by default and must be manually enabled by uncommenting the relevant line in the configuration file.
The Captcha class stores the generated verification code in the session under the key captcha. During verification, the stored code is retrieved from the session and compared with the user input.
Therefore, to make Captcha work in tp6 you must ensure that the session is started before generating or checking the code. In earlier PHP versions this depended on the php.ini setting, but tp6 provides its own session implementation that requires explicit activation.
Remember to enable the session in the tp6 configuration; otherwise the Captcha verification will always fail.
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