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');

}