您可以使用wp\\u login\\u表单，类似这样的

if ( ! is_user_logged_in() and <any-other-condition>){
    $args = array(
        \'echo\'           => false,
        \'redirect\'       => esc_url($_SERVER["HTTP_HOST"] . $_SERVER["REQUEST_URI"]), 
        \'label_username\' => __( \'Username\' ),
        \'label_password\' => __( \'Password\' ),
        \'label_remember\' => __( \'Remember Me\' ),
        \'label_log_in\'   => __( \'Log In\' ),
        \'id_username\'    => \'user_login\',
        \'id_password\'    => \'user_pass\',
        \'id_remember\'    => \'rememberme\',
        \'id_submit\'      => \'wp-submit\',
        \'remember\'       => true,
        \'value_username\' => NULL,
        \'value_remember\' => false
    );
    $loginform = wp_login_form( $args );
}
...continue and do whatever with $loginform