在 php 中的 X 字符后隐藏？

Question

I have a Wordpress site, and I want to set up a paywall for certain content. I would like to show some intro of each such article for Google index and users as well, but rest of it would be hidden for guests and available for logged in (in my case paid users).

I successfully implemented is_user_logged_in() PHP statement from Wordpress, but I am not finding PHP code anywhere online about hiding everything after n-characters, or words.

My intended workflow is:

<?php
if ( is_user_logged_in() ) {
    the_content();
} else {
    echo 'show only 200 characters or words of the content code should be here';
}
?>

Answer 1

You can use WordPress default function wp_trim_words .

<?php
    if ( is_user_logged_in() ) {
        the_content();
    } else {
        $content = get_the_content(); // $content is whatever your content field.
        echo wp_trim_words( $content, 200, ' ' );
    }
?>

Answer 2

<?php
if ( is_user_logged_in() ) {
the_content();
} else {
$content = get_the_content();
//If your template has some other way of getting the post content then use that variable.
echo substr($content, 0, strpos($content, ' ', 200)); 
}
?>