truncate.php

<?php

/**
 * Truncates a text without breaking the last word.
 * @param String $text
 * @param Int $length 
 * @param String $lastString
 * @return String
 */
function safe_truncate_text($text, $length = 160, $lastString = '...')
{
    $text = trim($text);
    
    $words = explode(' ', $text);
    
    $finalWords = array();
    $finalLength = 0;
    
    foreach ($words as $word) {
        if ($finalLength + strlen($word) <= $length) {
            $finalWords[] = $word;
            $finalLength += strlen($word) + 1;
        } else {
            break;
        }
    }
    
    $finalString = implode(' ', $finalWords);
    
    return  $finalString ? $finalString . $lastString : '';
}