How to limit WordPress post content length?

Use wp_trim_words() to cut a text to a number of words, and the excerpt_length filter to change the length of automatic excerpts.

$content = 'WordPress is a free and open source CMS. It runs a large part of the web and has thousands of themes and plugins for every kind of site.';

echo wp_trim_words( $content, 10, '...' ) . "\n";
echo wp_html_excerpt( $content, 40, '...' ) . "\n";
echo mb_strimwidth( $content, 0, 40, '...' );

• wp_trim_words( $text, $num_words, $more ): counts words, and removes the HTML tags.
• wp_html_excerpt( $str, $count, $more ): counts characters, and removes the HTML tags.

To change the length of the automatic excerpt (used by the_excerpt()), add a filter in functions.php:

add_filter( 'excerpt_length', function () {
	return 20; // words
}, 999 );

add_filter( 'excerpt_more', function () {
	return '...';
} );

Inside the loop you can use it with the content: echo wp_trim_words( get_the_content(), 30 );. The default excerpt is 55 words.

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