隐藏字符串部分信息用*号代替

<?php  echo  substr_replace($adm_info['moblie'],'****',3,4); ?> 

    /* 隐藏邮箱字符 */
     function hide_email($email){
        $n = strpos($email,'@');
        if($n<3){
            $email = substr_replace($email,'****',$n,0);
        }elseif ($n<6){
            $email = substr_replace($email,'****',2,$n-2);
        }else {
            $email = substr_replace($email,'****',2,4);
        }
        return $email;        
    }