How to hook into user registration process Before user registers

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I need to add a field to the user registration form and then validate it before I add a new user to my WordPress

I know how to hook into the registration form via add_filter('register_form', 'my_function');

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But how do I hook into the registration process before the user registers? Hence I do not want add_action('user_register','my_other_function');.

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2 comments

  1. You need to create your own hook for registration_errors filter:

    add_filter( 'registration_errors', 'wpse8170_registration_errors', 10, 3 );
function wpse8170_registration_errors( $errors, $sanitized_user_login, $user_email ) {
    if ( /* something happens */ ) {
        $errors->add( 'myexception_code', 'This is my message' );
    }

    return $errors;
}

  2. Take a look at the WordPress Codex: Customizing The Registration Form

    Theme and plugin developers can customize WordPress’s built-in user
    registration page through the use of hooks.

    Customizing the registration form involves utilizing the following
    three hooks:

    1. register_form
      Allows rendering of new HTML form elements.
    2. registration_errors
      Perform validation on form registration fields.
    3. user_register
      Save custom form data.

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