What are the ways to improve PHP SESSION response speed?

1. Set up multi-level directory storage SESSION

The default session storage directory is the first-level directory. If the user If the volume is relatively large, the number of session files will be relatively large. We can set the number of directories to 2. Using level 2 directories can improve search and access speeds. However, the speed improvement of this method is generally not very obvious. You can modify php.ini to modify the number of session storage directories.

session.save_path = "2;/tmp"

2. Store SESSION in redis

The session in php is stored in a file by default and supports the redis storage method because redis Key-value data is stored in memory, which can improve session access speed.

session.save_handler = redis
session.save_path = "tcp://127.0.0.1:6379"

3. Release the SESSION file lock promptly

When we use session, we need to execute the session_start() function first.

The session_start() function functions as follows:

Determine whether the http request contains a cookie named PHPSESSID. If not, create the cookie and write it to the http response. head File.

Find the corresponding session file through PHPSESSID, open the file in read-write mode, and then read the data inside to the memory.

Then we usually read or set the value of the session through the super global variable $_SESSION. When we operate, the value of the session is saved in the memory. By default, it is not set until the page is executed. will be written to the corresponding file.

We test this process through the following piece of code:

SESSION execution process analysis:

include "session_function.php"; 
//session_function.php代码在附录
session_start();
$_SESSION['name']="koastal";
echo "<br/>html content<br/>";
var_dump($_SESSION);
echo "<br/>";

Output result:

open
read
html content
array (size=1)
  'name' => string 'koastal' (length=7)
shutdown
write
close

It can be found from the above example that during the execution of the page (the execution process of the page refers to the time-consuming process of parsing the php file into the corresponding html file, rather than the user's time on the page) residence time), the session file is locked.

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