// Remove the last unfinished sentence in a paragraph if it contains $min_word_count or less words

paragraphs.php

// Remove the last unfinished sentence in a paragraph if it contains $min_word_count or less words
function remove_unfinished_sentence($paragraph, $min_word_count = 3, $replace = '.') {
	$min_word_count = $min_word_count > 1 ? $min_word_count : 1;
	return preg_replace('#(\.\s*([^\s\.]+\s+){0,'.($min_word_count-1).'}([^\s\.]+\s*))$#ms', $replace, $paragraph);
}