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Editorial Team
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Asked: 2026-05-29T19:45:06+00:00

I am making a loginform in WORDPRESS and i want to have a validation

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I am making a loginform in WORDPRESS and i want to have a validation on it, so i tried to look at the wp-login.php to see how they validate things. But i did not find what i am looking for. I would like to know how they validate things or what input do they need to validate things. I tried to search the wordpress forums all i can find is plugin, plugin and more plugin. I dont want a plugin. I want to hardcode it. So please help me.

  1. I want to know where you can find the part that searches for the users username and password.
  2. Or if not , know what is needed for a successful login. example username or password or others.

by the way here is the wp-login.php. THanks

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1 Answer

  1. Editorial Team

    Indeed the auth logic is not located in wp-login.php.

    WordPress relies a lot on hooks (actions and filters). For authentication, this article explain some of the process in wordpress 2.8+. AFAIK this is still the same in 3.x.

    Authentication process is based on the authenticate filter. Two hooks are added in the filter queue :

    • wp_authenticate_username_password() (priority 20) in wp-includes/user.php (line 68)

    • wp_authenticate_cookie() (priority 30) in wp-includes/user.php (line 117)

    See the article for more details.

    I encourage you not to hack the core directly but add some hooks on this filter with higher priorities.

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