Add a custom user meta data on registration based on user email

If this is being run when you register a user, then you could just grab the email used in creating the user as it is contained in the second argument that is passed to user_register which is $userdata. See https://developer.wordpress.org/reference/hooks/user_register/

Note that to provide you with an example that would actually result in something useable, I also added sanitize_title which is going to make the result “URL safe”. A raw email address is not a URL-safe value as the “@” is not a useable value.

add_action('user_register', 'add_form_link', 10, 2);

function add_form_link( $user_id, $userdata ) {
   $emailurl="https://www.ourwebsite.com/" . sanitize_title( $userdata['user_email'] ) . '/form/';
   add_user_meta( $user_id, 'Form_URL', $emailurl );

}

To make this more portable, I would recommend NOT saving the full URL, but rather everything after the domain. Then when using, you can append the local domain by using home_url(). Otherwise, by putting in a complete URL, you can’t make adjustments to the saved value later without manipulating the string result itself.

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