Create your own excerpt

wordpress-custom-excerpt.php

<?php
/**
 * Create your own custom excerpt for blog posts.
 *
 * Usage: echo my_custom_excerpt();
 * Or, with a modified length: echo my_custom_excerpt( 100 );
 *
 * @param int    $length Desired number of words to display
 * @param string $more   Characters you want to appear at the end of the excerpt
 *
 * @return string
 */
function my_custom_excerpt( $length = 55, $more = '...' ) {
	global $post; // Get the current post
	$post_content = $post->post_content;

	/*
	 * Uncomment this if you want to apply all the_content filters. This may include things
	 * like social share icons, etc. so I don't totally recommend this.
	 */
	//$post_content = apply_filters( 'the_content', $post_content );

	// Make shortcodes work. If you uncommented the above line then you DON'T need this too.
	$post_content = do_shortcode( $post_content );

	/*
	 * Want to strip some HTML tags out? Uncomment this.
	 * The second paramter should be a bunch of tags that you DON'T want to strip out.
	 * Everything else will be removed.
	 */
	//$post_content = strip_tags( $post_content, '<br><p>' );

	/*
	 * Now we cut the content down to your desired length and append the $more string.
	 *
	 * translators: If your word count is based on single characters (e.g. East Asian characters),
	 * enter 'characters_excluding_spaces' or 'characters_including_spaces'. Otherwise, enter 'words'.
	 * Do not translate into your own language.
	 */
	if ( strpos( _x( 'words', 'Word count type. Do not translate!' ), 'characters' ) === 0 && preg_match( '/^utf\-?8$/i', get_option( 'blog_charset' ) ) ) {
		$excerpt = trim( preg_replace( "/[\n\r\t ]+/", ' ', $post_content ), ' ' );
		preg_match_all( '/./u', $excerpt, $words_array );
		$words_array = array_slice( $words_array[0], 0, $length + 1 );
		$sep         = '';
	} else {
		$words_array = preg_split( "/[\n\r\t ]+/", $post_content, $length + 1, PREG_SPLIT_NO_EMPTY );
		$sep         = ' ';
	}

	if ( count( $words_array ) > $length ) {
		array_pop( $words_array );
		$excerpt = implode( $sep, $words_array );
		$excerpt = $excerpt . $more;
	} else {
		$excerpt = implode( $sep, $words_array );
	}

	// We use this to make sure none of our HTML tags got cut off.
	$excerpt = force_balance_tags( $excerpt );

	// Return the new excerpt.
	return $excerpt;
}