/**
* 文本截断+url链接加上gate.baidu.com前缀，自动处理超链接的截断
* @param String $str 原始内容，其中有a 标签
* @param integer $len 截取内容长度
* @param integer $urllen url截断显示的长度
* @return String 截断后的文本
*/
function smarty_modifier_cutcontent($str, $len = 1500, $urllen = 30)
{
//防止br被切割，先转成\n,截取后再fis_addbr中再转回来
$str = str_replace("<br />", "\n", $str);
//parse before cut
$str = fis_parselink($str, $urllen);
$lenarray = array('34', '50');
//no need cut
if (mb_strlen($str) < $len) {
return fis_addbr($str);
}
$str = mb_substr($str, 0, $len, 'utf-8');
//find last <a and </a> and check if it is ok
$pos_of_a = mb_strrpos($str, '<a');
if ($pos_of_a === false) {
return fis_addbr($str);
}
$pos_of_aend = mb_strrpos($str, '</a>');
//</a> is after <a>
if ($pos_of_a < $pos_of_aend) {
return fis_addbr($str);
}
//</a> is not after <a>
$str = mb_substr($str, 0, $pos_of_a, 'utf-8');
//$str = fis_addpoint($str);
return fis_addbr($str);
}
/**
* 与cutcontent相对应，返回相同截断策略后剩下的内容
* @param String $str 原始内容
* @param integer $start 起始截断offset
* @return String 截断后的内容
*/
function smarty_modifier_leftcontent($str, $start = 1500)
{
//防止br被切割，先转成\n,截取后再fis_addbr中再转回来
$str = str_replace("<br />", "\n", $str);
$str = fis_parselink($str);
$str_right = mb_substr($str, 0, $start, 'utf-8');
//find last <a and </a> and check if it is ok
$pos_of_a = mb_strrpos($str_right, '<a');
$pos_of_aend = mb_strrpos($str_right, '</a>');
if ($pos_of_a > $pos_of_aend) {
$str_right = mb_substr($str, 0, $pos_of_a, 'utf-8');
}
$str_left = mb_substr($str, mb_strlen($str_right), mb_strlen($str), 'utf-8');
return fis_addbr($str_left);
}