pp-wp-snippet-hide-exclusive-content.php

<?php
// This code snippet hides exclusive content if the user is not logged in

// To hide content you have to create a category with the slug 'only-for-members'
// All posts assigned to this category will be hidden from not logged in users

// Add a custom function to filter the content
add_filter( 'the_content', 'exclusive_content', 99 );

// If the user is not logged in, the excerpt will be displayed plus a message that the content is avialable only for registered users
// Also a link to the login page is displayed
// A link to the registration page is displayed only when registration of new users is allowed
function exclusive_content( $content ) {
  if ( in_category( 'only-for-members' ) && ! is_user_logged_in() ) {
    $content = '<p>' . get_the_excerpt() . '<br /><br />This content is available only for registered users. <a href="' .  wp_login_url( get_permalink() ) . '" title="Login">Login</a>' . ( ( get_option( 'users_can_register' ) ) ? ' <a href="' . wp_registration_url() . '" title="Register">Register Now</a>' : '' );
  }
  return $content;
}

?>