Função WordPress para gerar resumos com limite de caracteres

get_excerpt()

/**
 * Function get_excerpt
 *
 * @since  0.1
 *
 * @param  string $content with text to excerpt.
 * @param  string $limit number of the limit.
 * @param  string $after with element to print in end excerpt.
 *
 * @return string
 */

function get_excerpt( $content = '', $limit = '', $after = '' ){
	
	if ( $limit ) {
		$l = $limit;
	} else {
		$l = '140';
	}

	if ( $content ) {
		$excerpt = $content;
	} else {
		$excerpt = get_the_content();
	}
 
	$excerpt = preg_replace( " (\[.*?\])",'',$excerpt );
	$excerpt = strip_shortcodes( $excerpt );
	$excerpt = strip_tags( $excerpt );
	$excerpt = substr( $excerpt, 0, $l );
	$excerpt = substr( $excerpt, 0, strripos($excerpt, " " ) );
	$excerpt = trim( preg_replace( '/\s+/', ' ', $excerpt ) );
	
	if ( $after ) {
		$a = $after;
	} else {
		$a = '...';
	}

	$excerpt = $excerpt . $a;
	return $excerpt;
}