Wordpress注册表获取用户名字段的值

Question

I am trying to populate the referral_code field with REF-{{USERNAME}} which is the value entered into the default wordpress username registration field:

Wordpress Default Username Field:

<p>
    <label for="user_login">Username<br>
    <input type="text" name="user_login" id="user_login" class="input" value="" size="20" autocapitalize="off"></label>
</p>

My Custom Function To Add Extra Fields

<?php 
function gw_registration_form() {
    $full_name = ( ! empty( $_POST['full_name'] ) ) ? sanitize_text_field( $_POST['full_name'] ) : '';
    $company_name = ( ! empty( $_POST['company_name'] ) ) ? sanitize_text_field( $_POST['company_name'] ) : '';
    $telephone = ( ! empty( $_POST['telephone'] ) ) ? sanitize_text_field( $_POST['telephone'] ) : '';
    $referral_code = ( ! empty( $_POST['referral_code'] ) ) ? sanitize_text_field( $_POST['referral_code'] ) : '';?>
    <p>
        <label for="full_name"><?php _e( 'Full Name', 'mydomain' ) ?><br />
        <input type="text" name="full_name" id="full_name" class="input" value="<?php echo esc_attr(  $full_name  ); ?>" size="25" /></label>
    </p>
    <p>
        <label for="company_name"><?php _e( 'Company Name', 'mydomain' ) ?><br />
        <input type="text" name="company_name" id="company_name" class="input" value="<?php echo esc_attr(  $company_name  ); ?>" size="25" /></label>
    </p>
    <p>
        <label for="telephone"><?php _e( 'Telephone Number', 'mydomain' ) ?><br />
        <input type="text" name="telephone" id="telephone" class="input" value="<?php echo esc_attr(  $telephone  ); ?>" size="25" /></label>
    </p>
    <p>
        <label for="referral_code"><?php _e( 'Your Referral Code', 'mydomain' ) ?><br />
        <input type="text" name="referral_code" id="referral_code" class="input" value="REF-<?php echo esc_attr(  $user_login  ); ?>" size="25" readonly/></label>
    </p>
    <?php
};

I've since just removed the referral code out and made it set the value on registering/saving, however, I do believe someone providing an answer to how said would be achieved in this question would be beneficial to other users.

Answer 1

There is a WP function for that: https://codex.wordpress.org/Function_Reference/wp_get_current_user

Used like this you can get the user_login. From the Docs:

<?php
  $current_user = wp_get_current_user();

  echo $current_user->user_login; /* here is your user_login */
?>