织梦php汉字字符串中间插入换行符方法

织梦php汉字字符串中间插入换行符实现函数方法：

function strsub($str)
{
$str_count=mb_strlen($str,'utf-8');
$mid=ceil($str_count/2);
    return mb_substr($str,0,$mid,'utf-8')."<br/>".mb_substr($str,$mid,$str_count,'utf-8');
}