php中文截取字符串

/*
 * 中文截取字符串
 * 第三个参数是false，不加...
 */

function cutUtf8($string, $length, $etc = '...') {
    $result = '';
    $string = html_entity_decode(trim(strip_tags($string)), ENT_QUOTES, 'UTF-8');
    $strlen = strlen($string);
    for ($i = 0; (($i < $strlen) && ($length > 0)); $i++) {
        if ($number = strpos(str_pad(decbin(ord(substr($string, $i, 1))), 8, '0', STR_PAD_LEFT), '0')) {
            if ($length < 1.0) {
                break;
            }
            $result .= substr($string, $i, $number);
            $length -= 1.0;
            $i += $number - 1;
        } else {
            $result .= substr($string, $i, 1);
            $length -= 0.5;
        }
    }
    $result = htmlspecialchars($result, ENT_QUOTES, 'UTF-8');
    if ($i < $strlen) {
        $result .= $etc;
    }
    return $result;
}

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