截取邮箱@后面内容的两种情况

<?php
    $email = 'houmin@yahoo.com.cn';
    $re = explode('@', $email);
    echo $re[1];    //输出"yahoo.com.cn"
?>

<?php
    $email = 'houmin@yahoo.com.cn';
    preg_match('/@(w+).com/',$email,$re);
    echo $re[1];    //输出"yahoo"
?>