php:Does Session have to rely on Cookie_PHP Tutorial

The session in php can use the client's cookie by default (to distinguish it from cookies in the ordinary sense, I call it session cookie, and cookies in the ordinary sense are cookies) to save the session id, but in php Can the session only use session cookies?

Of course not, otherwise why bother to create a session? It is better to just use cookies. One of the advantages of sessions is that when the client's cookie is disabled, the session id will be automatically attached to the URL, so that the session id can be used Can remember session variables.

Let me write two files to confirm. First, disable cookies in the browser.

[php]
//The file name is test1.php
session_start();
session_register("url");
$url="test2.php";
echo "goto test2.php";
?>

//The file name is test1.php
session_start();
session_register("url");
$url="test2.php";
echo "goto test2.php";
?> [php]
session_start();
if (session_is_registered("url")) {
echo "congratulations.";
$url="test1.php";
echo "goto test1.php";
} else
echo "failed.";
?>

session_start();
if (session_is_registered("url")) {
echo "congratulations.";
$url="test1.php";
echo "goto test1.php";
} else
echo "failed.";
?>

Now enter "http://localhost/test1.php" in the browser, move the mouse over the link and look at the address on the status bar. It is not simply "http://localhost/test2.php", but this In the form: "http://localhost/test2.php?phpsessid=6e3610749f7ded3784bc4a4dd10f879b".
You can also view the source file of html, the source file is in this form:
goto test2.php
So this is entirely due to PHP and has nothing to do with the browser, which means that the session is valid no matter what browser you use, not only for IE as some people think.
However, our hyperlink statement is output by the echo statement. What will happen if the hyperlink is not included in the PHP tag ? Let’s write an example to verify it. Make test1.php a little bit Modification:

[html]
session_start();
session_register("url");
$url="test2.php";
echo "goto test2.php";?>
(html form)goto test2.php

session_start();
session_register("url");
$url="test2.php";
echo "goto test2.php";?>
(html form)goto test2.php
Enter "http://localhost/test1.php" in the browser, move the mouse to the two links respectively to see if there is any difference? You can see that the two links are exactly the same, and the session ID will be automatically attached later. .So don’t worry that links that are not included in the php tag will become invalid, php will not be so stupid.
But when using it, please note that you must first use the session_start() function to tell php to start using the session, even if you only have html code in this file, such as:




gogogo
…………

I remember someone said that this advantage can only be exerted under linux/unix, but I use win2000p+apache1.3.17+php4.0.4pl1, php is the apache module mode, but it still works. On the contrary, I switched When I went to Linux for testing, it didn't work. In fact, an option during compilation --enable-trans-sid controls whether this function is useful. When compiling according to PHP default, this function is not turned on. Just Just add it when recompiling. My configuration is apache1.3.17+php4.0.4pl1, and php is in apache module mode. After recompiling on Linux, the test with netscape navigator4.7 can pass (this further proves that it has nothing to do with the browser) ).
Session alone cannot be used across windows. Even if you enable cookies, when you have a legal session id in a window (recorded in the session cookie, not in the URL), and then open a new window to enter the same page, You will have a new session id again without affecting the previous window.
If you want to use the same session ID across windows, you can only specify the session ID after the URL. That is to say, if you copy the URL of the window with the session ID and paste it in a newly opened window, it will still be used. Knowing the principle of session id, it is not difficult to implement a cross-window session. You can combine cookies with sessions. First obtain the current legal session id, then record it in the cookie, and then read the cookie in other windows to obtain it. The current session id.

http://www.bkjia.com/PHPjc/477502.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/477502.htmlTechArticleThe session in php can use client cookies by default (to distinguish it from cookies in the ordinary sense, I It is called a session cookie (a cookie in the ordinary sense is a cookie) to save sessi...