WordPress permalink included.

How can I truncate a string after 40 words in PHP

echo limit_text( get_field('village_finds_report'), 40, get_permalink( get_the_id() ) );

// originally taken from
// https://stackoverflow.com/questions/965235/how-can-i-truncate-a-string-to-the-first-20-words-in-php
// slightly adjusted to include a url.
function limit_text($text, $limit=40, $url='') {
    if (str_word_count($text, 0) > $limit) {
        $words = str_word_count($text, 2);
        $pos = array_keys($words);
        $text = substr($text, 0, $pos[$limit]) . '...';
        if( $url ){ $text.= ' <a href="'.$url.'" class="view-article">View Article</a>'; }
    }
    return $text;
}