自动注销时间

Create or edit your php.ini file and set this variable value in it:

session.gc_maxlifetime = 1440

The integer is in seconds. 500000 seconds is 5.7 days. Then restart apache.

Changing php.ini will change the session duration for all the websites running on the server. To change it just for PhpMyAdmin, open config.inc.php and add:

$sessionDuration = 60*60*24*7; // 60*60*24*7 = one week
ini_set('session.gc_maxlifetime', $sessionDuration);
$cfg['LoginCookieValidity'] = $sessionDuration;

For LOCAL installs only, you can remove the login and timeout altogether - this seems to be what you're after. By changing the authorization type to "config" and entering your database username and password in your config file you are automatically logged in. Add to config.inc.php:

$cfg['Servers'][$i]['verbose'] = '';
$cfg['Servers'][$i]['host'] = 'localhost';
$cfg['Servers'][$i]['port'] = '';
$cfg['Servers'][$i]['socket'] = '';
$cfg['Servers'][$i]['connect_type'] = 'tcp';
$cfg['Servers'][$i]['extension'] = 'mysqli';
$cfg['Servers'][$i]['auth_type'] = 'config';
$cfg['Servers'][$i]['user'] = 'username';
$cfg['Servers'][$i]['password'] = 'password';
$cfg['Servers'][$i]['AllowNoPassword'] = false;

Of-course if you do this on a server on the internet, some cheeky chappy will come along and gleefully download all your passwords and delete your website. This is for a development server running on your own laptop only.

An easier way to customise phpmyadmin these days is to go to http://www.example.com/phpmyadmin/setup/ , save all your settings section at a time, click save or download at the bottom, copy the file generated to your root phpmyadmin directory, then chmod it. You have to turn off write permission even if it is a local server as phpmyadmin checks this before it lets yo log in.

You can change the cookie time session feature at phpmyadmin web interface

Settings->Features->General->Login cookie validity

OR

If you want to change the 'login cookie validity' in configuration file, then open the phpmMyAdmin configuration file, config.inc.php in the root directory of PHPMyAdmin.(root directory is usually /etc/phpmyadmin/)

After locating the config.inc.php , search for the line below and set it to the value of seconds you want phpmyadmin to timeout:

['LoginCookieValidity']

If you couldn't find the above line, just add the following:

$cfg['Servers'][$i]['LoginCookieValidity'] = <your_new_timeout>;

For example:

$cfg['Servers'][$i]['LoginCookieValidity'] = 3600 * 3;

The Timeout is set to 3 Hours from the Example above.

session.gc_maxlifetime might limit session validity and if the session is lost, the login cookie is also invalidated. So, we may need to set the session.gc_maxlifetime in php.ini configuration file(file location is /etc/php5 /apache2/php.ini in ubuntu).

session.gc_maxlifetime = 3600 * 3

$cfg['LoginCookieValidity']

Type: integer [number of seconds]
Default value: 1440

Define how long a login cookie is valid. Please note that php configuration option session.gc_maxlifetime might limit session validity and if the session is lost, the login cookie is also invalidated. So it is a good idea to set session.gc_maxlifetime at least to the same value of $cfg['LoginCookieValidity'].

NOTE:

1. If your server crashed and cannot load your phpmyadmin page, check your apache log at /var/log/apache2/error.log. If you got PHP Fatal error: Call to a member function get() on a non-object in /path/to/phpmyadmin/libraries/Header.class.php on line 135, then do a chmod 644 config.inc.php. that should take care of the error.
2. If you get the warning: Your PHP parameter session.gc_maxlifetime is lower that cookie validity configured in phpMyAdmin, because of this, your login will expire sooner than configured in phpMyAdmin., then change the session.gc_maxlifetime as mentioned above.

In PHPMyAdmin 4 this no longer appears in the config.inc.php file. Instead go to PHPMyAdmin in your browser. Ensure you are at the localhost level to see the Settings link. Then set Settings > Features > Change the value of 'Login cookie validity' > Save

Server:localhost -> Settings -> Features -> General -> Login cookie validity

Explore directory 'apps\phpmyadmin4.5.2' in your wamp folder and open config.inc.php file. Then add this line under existing code.

'$cfg['LoginCookieValidity'] = 3600 * 10; //login cookie validity extended upto 10 hours'.

That's all...

I have phpmyadmin 4.9.2. and try to config LoginCookieValidity, but I have auto logout :( If you using localhost you can try https://docs.phpmyadmin.net/en/latest/config.html#example-for-ip-address-limited-autologin

if ($_SERVER["REMOTE_ADDR"] == "127.0.0.1") {
$cfg['Servers'][$i]['auth_type'] = 'config';
$cfg['Servers'][$i]['user'] = 'root';
$cfg['Servers'][$i]['password'] = 'yourpassword';
} else {
$cfg['Servers'][$i]['auth_type'] = 'cookie';
}

For phpMyadmin 5.0.2 running on Ubuntu 18.04, I edited the file as follows:

1. sudo nano /usr/share/phpmyadmin/libraries/classes/Config/Forms/User/FeaturesForm.php

2. find the method public static function getForms() and added LoginCookieValidity field

   public static function getForms()
   {
   $result = [
   'General' => [
   'VersionCheck',
   'NaturalOrder',
   'InitialSlidersState',
   'LoginCookieValidity', //Added this line if it missing
   ...........
   }
   

3. save the file and now you will be able to change the value from user interface.

[Settings -> General -> Features -> Login Cookie Validatity]