I am looking for any built in function that when I add a user or a user wants to register, the username will be automatically prepended with a predefined text.

For example, if the user registers with abul, the username will be saved as tk_abul.

I am looking for any built in function that when I add a user or a user wants to register, the username will be automatically prepended with a predefined text.

For example, if the user registers with abul, the username will be saved as tk_abul.

• plugin-development
• user-registration

Share Improve this question edited May 9, 2019 at 8:36 Fayaz 9,01722 gold badges3333 silver badges5151 bronze badges asked May 9, 2019 at 7:01 Akhtarujjaman ShuvoAkhtarujjaman Shuvo 20811 silver badge66 bronze badges 2

• how do you save the user? – Vishwa Commented May 9, 2019 at 7:06
• I want to add user from WordPress dashboard – Akhtarujjaman Shuvo Commented May 9, 2019 at 7:09

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2 Answers 2

Sorted by: Reset to default 1

You can use pre_user_login filter to customize username when registered. Example.

add_filter( 'pre_user_login', 'wpse_customize_user' );

function wpse_customize_user( $username ) {
    return 'tk_' . $username;
}

Try user_register hook. The following code wasn't tested.

<?php
add_action( 'user_register', 'my_nickname_prepend_function' );

function my_nickname_prepend_function( $user_id )
{
    if ( isset( $_POST['user_login'] ) )
        update_user_meta( $user_id, 'nickname', 'tk_' . $_POST['user_login'] );
    }
}

Remember about user input validation.

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