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

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!

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