function fixEncoding($s, $encoding = 'UTF-8') {   
    $s = @iconv('UTF-16', $encoding . '//IGNORE', iconv($encoding, 'UTF-16//IGNORE', $s)); 
    return str_replace("\xEF\xBB\xBF", '', $s);
}

function summarize($haystack, $needle, $wordLimit = 5) {

    $haystack = fixEncoding($haystack);
    $needle = fixEncoding($needle);
    // first get summary of text around key word (needle)
    $preg_safe = str_replace(" ", "\s", preg_quote($needle));

    $pattern = "/(\w*\S\s+){0,$wordLimit}\S*\b($preg_safe)\b\S*(\s\S+){0,$wordLimit}/iux";
    if (preg_match_all($pattern, $haystack, $matches)) {
        $summary = str_replace(strtolower($needle), "<strong>$needle</strong>", $matches[0][0]) . '…';
    } else {
        $summary = false;
    }

    return $summary;
}