dont understand where this action takes in form action wordpress - php

Question

i am new to wordpress and trying to modify theme. but i am not able to track form action.
<form action="<?php echo appthemes_get_registration_url( 'login_post' ); ?>" method="post" class="login-form register-form custom" name="registerform" id="login-form">
where these action takes ? how data is stored ?
this is the function.php where i get following function code .
function appthemes_get_registration_url( $context = 'display' ) {
if ( current_theme_supports( 'app-login' ) && ( $page_id = APP_Registration::get_id() ) ) {
$url = get_permalink( $page_id );
} else {
$url = site_url( 'wp-login.php?action=register' );
}
if ( ! empty( $_REQUEST['redirect_to'] ) ) {
$url = add_query_arg( 'redirect_to', urlencode( $_REQUEST['redirect_to'] ), $url );
}
return esc_url( $url, null, $context );
}
can anyone help me with this issue?
i am stuck here.

Answer 1

According to the function being used
$url = get_permalink( $page_id );
The above code will get the link of the current custom login page which the theme uses.
Or else it will go to the default WordPress register page
$url = site_url( 'wp-login.php?action=register' );
There is a redirect field in the theme after the registration is over, which makes the user to go to the required page. If it is empty, then it can be skipped or else it is returned to the redirect URL specified.
if ( ! empty( $_REQUEST['redirect_to'] ) ) {
$url = add_query_arg( 'redirect_to', urlencode( $_REQUEST['redirect_to'] ), $url );
}
The data of your registration is stored in a table called users which you can access through PHPmyAdmin