$title=mb_substr($vo['title'], 0,10, 'utf-8')
$str = '我abc是谁'; //utf-8编码的字符串
echo mb_substr($str, 0, 2, 'utf-8'); //输出 我a
$str = '我是谁'; //gbk编码的字符串
echo mb_substr($str, 0, 1, 'gbk'); //输出 我
转载:https://blog.csdn.net/kbx8916/article/details/52551553