HTTP、HTTPS协议下跨域解决session共享的办法，也许不是最好的，但是比较实用。如下是具体的解决方案。
$currentSessionID=session_id(); session_id($currentSessionID);
简单示例代码：
(HTTP)
<?php session_start(); $currentSessionID=session_id(); $_SESSION['username']='Alixixi'; echo '<a href="https://www.Alixixi.com/jquery.php?session="'.$currentSessionID.'">点击这里跳转到HTTPS协议下</a>';
(HTTPS)
<?php
$currentSessionID=$_GET['session'];
session_id($currentSessionID);
session_start();
if(!empty($_SESSION['username'])){
echo $_SESSION['username'];
}else{
echo 'Session did not work.';
}
有点安全性的问题，因为这样子的话session id的传输是没加密的，别人可以嗅探侦测到，获取这个session id进而获取你的session数据。所以有必要的话可以考虑加密这个id值。关于加密方面的文章可参照本站：
PHP加密解密的函数
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