excerpt.php

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<?php
$text = elgg_extract('text', $vars, '');
$text = trim(elgg_strip_tags($text));

$suffix = elgg_extract('suffix', $vars, '...');

$string_length = elgg_strlen($text);
$num_chars = (int) elgg_extract('num_chars', $vars, 250);

if ($string_length <= $num_chars) {
    echo $text;
    return;
}

// handle cases
$excerpt = elgg_substr($text, 0, $num_chars);
$space = elgg_strrpos($excerpt, ' ', 0);

// don't crop if can't find a space.
if ($space === false) {
    $space = $num_chars;
}
$excerpt = trim(elgg_substr($excerpt, 0, $space));

if ($string_length != elgg_strlen($excerpt)) {
    $excerpt .= $suffix;
}

echo $excerpt;