PHP method to implement session custom session processor, session session

PHP method to implement session custom session processor, session session_PHP tutorial

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Release： 2016-07-13 10:08:54

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php method to implement session custom session processor, session session

The example in this article describes how to implement a custom session processor in PHP. Share it with everyone for your reference. The specific analysis is as follows:

Session custom session processor, that is to say, all various operations on the session can be decided by customizing the session. What does it mean? Let’s first look at the session.save_handler configuration in php.ini.

By default, session.save_handler = files, which means that the system-defined processor is called (the so-called processor is actually a lot of functions/methods). You can set session.save_handler to user or memcache, or even network file system (cloud computing).

session.save_handler = user: Indicates calling a custom session handler; session.save_handler = memcache: Indicates... slightly.... (roughly saved in memory, more efficient).

When setting session.save_handler = files, regarding the operation of the session, six callback functions of session.set_save_handler (see the PHP manual for details) are actually called (the so-called callback functions are called by the system and do not need to be specified). . See the code below for the six callback functions, which are also available in the PHP manual:

Copy code The code is as follows:

function open($save_path, $session_name)
{
global $sess_save_path;
$sess_save_path = $save_path;
return(true);
}

function close()
{
return(true);
}

function read($id)
{
global $sess_save_path;
$sess_file = "$sess_save_path/sess_$id";
return (string) @file_get_contents($sess_file);
}

function destroy($id)
{
global $sess_save_path;
$sess_file = "$sess_save_path/sess_$id";
return(@unlink($sess_file));
}

function gc($maxlifetime)
{
global $sess_save_path;
foreach (glob("$sess_save_path/sess_*") as $filename) {
If (filemtime($filename) + $maxlifetime < time()) {
@unlink($filename);
}
}
return true;
}

session_set_save_handler("open", "close", "read", "write", "destroy", "gc");
session_start();
// proceed to use sessions normally
?>

When you set session.save_handler to user, you can rewrite the above code into the method you need and call it in the executed php file. For example, by default, the file names we save sessions start with sess_, which is actually set here. You can change it to what you want.

Of course, you can also modify the way the session is saved. The default is to save it in a file. You can save it in the database (of course it is not recommended that you do this, the database reading speed is slower), or you can set it to be saved in the memory. (The fastest speed, explained in detail in memcache related content).

I hope this article will be helpful to everyone’s PHP programming design.