link to an external url

Please link to an example page on your site where I can see this.

How is the form built? Are you validating/sanitizing the input for the URL field with esc_url()?

See https://codex.www.ads-software.com/Validating_Sanitizing_and_Escaping_User_Data

Make sure that the $webpage variable is a complete URL. This includes the “https://” part.

<tr>
<td><label for="register-web"><?php _e('Pagina web:',$current_locale_name) ?></label></td>
`<td><input type=”text” class=”do_input” name=”web” id=”web” size=”30″ maxlength=”20″ value=”<?php echo esc_html($userweb); ?>” /></td>
</tr>
This is the field from the form.

$webpage = $_POST[‘web’];

https://localhost/mysite/www.mypage.com
This is what I get: mysite is my site and https://www.mypage.com is data stored in $webpage. I want just https://www.mypage.com

Try it with

esc_url( $userweb )

instead of

esc_html( $userweb )

It works fine now. Thank you.