中文截取：mb_substr()

mb_substr( $str, $start, $length, $encoding )

$str，需要截断的字符串
$start，截断开始处，起始处为0
$length，要截取的字数

$encoding，网页编码，如utf-8,GB2312,GBK

<?php echo mb_substr( $gg['news_content'], 0, 30, utf-8 )