$_SESSION doesn't keep the ldap $link_identifier

问题

I encountered a strange behaviour of the session variable when storing the ldap link identifier to it. For that I have created two php snippets.

test1.php:

<?php
  session_start();
  $_SESSION['test']=ldap_connect('ldap://asc-OpenLDAP.asc.asc-syscon.de');
  echo $_SESSION['test'];
?>

Output: Resource id #2

So far everything is nice and fine. But then when I try to use $_SESSION on the second page it suddenly holds a wrong value.

test1.php:

<?php
  session_start();
  $_SESSION['test']=ldap_connect('ldap://asc-OpenLDAP.asc.asc-syscon.de');
  header('Location:test2.php');
?>

test2.php:

<?php
  session_start();
  echo $_SESSION['test'];
?>

Output: 0

Why is that so? How can I make it keep the correct value from test1.php?

Looking forward to your help.

回答1:

You cannot store Resource in storage, because session data is serialized before save. Read this http://php.net/manual/en/function.serialize.php

来源：https://stackoverflow.com/questions/42388191/session-doesnt-keep-the-ldap-link-identifier