方法一，strip_tags（）剥去字符串中的 HTML 标签：
<?php
echo strip_tags("Hello <b>world!</b>");
//运行结果：Hello world!
?>方法二，自定义函数去除
function cutstr_html($string, $sublen){
$string = strip_tags($string);
$string = preg_replace ('/\n/is', '', $string);
$string = preg_replace ('/ | /is', '', $string);
$string = preg_replace ('/ /is', '', $string);
preg_match_all("/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|\xe0[\xa0-\xbf][\x80-\xbf]|[\xe1-\xef][\x80-\xbf][\x80-\xbf]|\xf0[\x90-\xbf][\x80-\xbf][\x80-\xbf]|[\xf1-\xf7][\x80-\xbf][\x80-\xbf][\x80-\xbf]/", $string, $t_string);
if(count($t_string[0]) - 0 > $sublen) $string = join('', array_slice($t_string[0], 0, $sublen))."…";
else $string = join('', array_slice($t_string[0], 0, $sublen));
return $string;
}