亲测可用解决

<?php                //解决个别中文乱码                function mbStrreplace($content,$to_encoding="UTF-8",$from_encoding="GBK") {                    $content=mb_convert_encoding($content,$to_encoding,$from_encoding);                    $str=mb_convert_encoding(" ",$to_encoding,$from_encoding);                    $content=mb_eregi_replace($str," ",$content);                    $content=mb_convert_encoding($content,$from_encoding,$to_encoding);                    $content=trim($content);                    return $content;                }                $follow_up_message = str_replace("。","。</br>",$data['follow_up_message']);                echo mbStrreplace($follow_up_message); ?>