glueckpress/wp-maybe-has-more-link.php

## wp-maybe-has-more-link.php
<?php
/**
 * Takes a WordPress post ID and checks if the post has a more link.
 *
 * @author Caspar Hübinger
 * @uses   get_extended()
 * @link   https://developer.wordpress.org/reference/functions/get_extended/
 *
 * @param  int     $post_id Post ID
 * @return boolean          True if text exists before more tag, else false
 */
function maybe_has_more_link( $post_id ) {

	$post = get_post( $post_id );
	$content = $post->post_content;
	$data_array = get_extended( $content );

	return '' !== $data_array['extended'];
}
	<?php
	/**
	* Takes a WordPress post ID and checks if the post has a more link.
	*
	* @author Caspar Hübinger
	* @uses get_extended()
	* @link https://developer.wordpress.org/reference/functions/get_extended/
	*
	* @param int $post_id Post ID
	* @return boolean True if text exists before more tag, else false
	*/
	function maybe_has_more_link( $post_id ) {

	$post = get_post( $post_id );
	$content = $post->post_content;
	$data_array = get_extended( $content );

	return '' !== $data_array['extended'];
	}