Shorten and Limit Headline by 110 characters for Schema plugin https://schema.press/

schema-wp-shorten-headline.php

<?php //* do not include php tag

add_filter('schema_output', 'schema_wp_shorten_headline_output_98734524456');
/**
 * Shorten / Limit Headline in Schema Output
 *
 * String length of headline must be in range [0, 110]
 *
 * @since 1.0
 */
function schema_wp_shorten_headline_output_98734524456( $schema ) {
	
	global $post;
	
	if ( empty($schema) ) return;
	
	$more = '…'; // indicate that it was shortened
	
	// shorten to a number of words

	// $num_words = 12; // change to your liking
	// $schema['headline']	= wp_trim_words( $schema['headline'], $num_words, $more );
	
	// shorten to a number of characters

	// $num_characters = 110; // change to your liking
	// $schema['headline']	= substr( $schema['headline'], 0, $num_characters ); 
	
	// or...

	$num_characters = 109; // change to your liking, recommended is 109
	$schema['headline'] = rtrim( mb_strimwidth( $schema['headline'], 0, $num_characters ) ) . $more;
	
	return $schema;
}