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<?php

// Redirect wp-login.php to custom url
add_action( 'login_form_login', 'mwm_redirect_login' );
function mwm_redirect_login() {
    wp_redirect( home_url() );
	exit();
}

// Redirect wp-login.php?action=register to custom url
add_action( 'login_form_register', 'mwm_redirect_register' );
function mwm_redirect_register() {
    wp_redirect( home_url('join') );
	exit();
}