What should I do if PHP cannot obtain SESSION information?

Solution to the problem that PHP cannot obtain SESSION information: first check [php.ini] and check whether [/var/tmp] has read and write permissions; then check the [php-fpm] configuration file; finally restart [php-fpm].

Solution to PHP failing to obtain SESSION information:

1. Check php.ini

vim /etc/php.ini

Check these items:

session.save_handler = files // session 的存储类型；
 
session.auto_start = 1 //是否自启动
 
session.save_path = "/var/tmp" //存储位置

2. Check whether /var/tmp has read and write permissions, if not:

chmod 777 -R /var/tmp

3. Check the php-fpm configuration file

vim /etc/php-fpm.d/www.conf

Check these items:

php_value[session.save_handler] = files
 
php_value[session.save_path] = /var/tmp
 
php_value[soap.wsdl_cache_dir] = /var/tmp

Change to the same path as php.ini

4. Restart php-fpm

/bin/systemctl restart php-fpm.service

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