Show only the first 300 words / 50 lines of blog posts for non registered users

Question

Is it possible to show ONLY the first 300 words (or even 50 lines) of every blog post for anonymous users? Instead of show the whole article on the page? And after registration all the post would show.

Thanks!!!

Answer 1

It wasn't quite as easy as @Pat J made it sound, especially if you want HTML formatting with your copy. I cribbed from this answer and came up with the following code for you. I've tested it and it works:

    // If the user is logged in, display the full content
    if(is_user_logged_in()):
        the_content();
    else: // The user isn't logged in and should only see the first 300 words
        echo force_balance_tags( html_entity_decode( wp_trim_words( htmlentities( wpautop(get_the_content()) ), 300, '...' ) ) );
    endif;

UPDATE

There are 2 errors in your code. One is the ; after the initial if statement, and the arrays don't match: $roles v $role.

The following code integrates the original answer (logged in/out) with your modifications (if is array):

    if(is_user_logged_in()): 
        if( in_array( 'administrator', $roles ) || in_array( 'pmpro_role_2', $roles ) || in_array( 'pmpro_role_1', $roles )): 
            the_content();
        else: 
            echo force_balance_tags( html_entity_decode( wp_trim_words( htmlentities( wpautop(get_the_content()) ), 300, '...' ) ) );
        endif; 
     else:
        echo force_balance_tags( html_entity_decode( wp_trim_words( htmlentities( wpautop(get_the_content()) ), 100, '...' ) ) );
     endif;

Good luck!

Answer 2

You can use the excerpt to accomplish this, nonetheless the excerpt by default filter all HTML tags. To fix this, we need to filter and add new logic to it.

This will work filteryng the excerpt to change according to your needs:

You have to add this function in your theme's functions.php

functions.php

function wpse_allowedtags() {
    //The Tags you put here will not be removed, therefore if you want to include strong HTML tag, you should add it here as shown:
        return '<strong>'; 
    }

if ( ! function_exists( 'wpse_custom_wp_trim_excerpt' ) ) : 

    function wpse_custom_wp_trim_excerpt($wpse_excerpt) {
    $raw_excerpt = $wpse_excerpt;
        if ( '' == $wpse_excerpt ) {

            $wpse_excerpt = get_the_content('');
            $wpse_excerpt = strip_shortcodes( $wpse_excerpt );
            $wpse_excerpt = apply_filters('the_content', $wpse_excerpt);
            $wpse_excerpt = str_replace(']]>', ']]&gt;', $wpse_excerpt);
            $wpse_excerpt = strip_tags($wpse_excerpt, wpse_allowedtags()); /*IF you need to allow just certain tags. Delete if all tags are allowed */

            /*Set the excerpt word count and only break after sentence is complete.
            You can set this to any number you want in this case we'll use 300 
            words. */
                $excerpt_word_count = 300;
                $excerpt_length = apply_filters('excerpt_length', $excerpt_word_count); 
                $tokens = array();
                $excerptOutput = '';
                $count = 0;

                // Divide the string into tokens; HTML tags, or words, followed by any whitespace in order to clean the not allowed HTML tags.
                preg_match_all('/(<[^>]+>|[^<>\s]+)\s*/u', $wpse_excerpt, $tokens);

                foreach ($tokens[0] as $token) { 

                    if ($count >= $excerpt_length && preg_match('/[\,\;\?\.\!]\s*$/uS', $token)) { 
                    // Limit reached, continue until , ; ? . or ! occur at the end
                        $excerptOutput .= trim($token);
                        break;
                    }

                    // Add words to complete sentence
                    $count++;

                    // Append what's left of the token
                    $excerptOutput .= $token;
                }

            $wpse_excerpt = trim(force_balance_tags($excerptOutput));

            if ( $count <  0) {   
                $excerpt_end = ' <a href="'. esc_url( get_permalink() ) . '">' . '&nbsp;&raquo;&nbsp;' . sprintf(__( 'Reed more: %s &nbsp;&raquo;', 'wpse' ), get_the_title()) . '</a>'; 
               $excerpt_more = apply_filters('excerpt_more', ' ' . $excerpt_end); 
               $wpse_excerpt .= $excerpt_more; /*Add read more in new paragraph */
           }  
           $wpse_excerpt .= ' [...]';

            return $wpse_excerpt;   

        }
        return apply_filters('wpse_custom_wp_trim_excerpt', $wpse_excerpt, $raw_excerpt);
    }

endif; 

remove_filter('get_the_excerpt', 'wp_trim_excerpt');
add_filter('get_the_excerpt', 'wpse_custom_wp_trim_excerpt'); 

After that, you only need to call the_excerpt to non registered users in the desired template file of your theme: (remember that it has been previously filtered to include 300 words)

 // The user is logged in, display the full content
    if(is_user_logged_in()){
       the_content();
     }else{
        // show the_excerpt
        <?php echo get_the_excerpt() ?>
     }