/var/tmp full - php fpm session

hi i received : Disk usage warning The filesystem "/var/tmp" mounted at "/var/tmp" reached "warn" status because you currently use 84.5% of its available inodes. After some search it seems that i have : du -sh * ... 8.0K systemd-private-1e1aa62465b94ad8bff844f93d44c48c-chronyd.service-cqGJIU 6.3G systemd-private-1e1aa62465b94ad8bff844f93d44c48c-ea-php56-php-fpm.service-SdcgQh 8.0K systemd-private-1e1aa62465b94ad8bff844f93d44c48c-ea-php56-php-fpm.service-Zh5O5L 8.0K systemd-private-1e1aa62465b94ad8bff844f93d44c48c-ea-php71-php-fpm.service-jveoOA 91M systemd-private-1e1aa62465b94ad8bff844f93d44c48c-ea-php71-php-fpm.service-s90780 8.0K systemd-private-1e1aa62465b94ad8bff844f93d44c48c-ea-php72-php-fpm.service-fS1Hix 8.0K systemd-private-1e1aa62465b94ad8bff844f93d44c48c-ea-php72-php-fpm.service-Sn7uxg 8.0K systemd-private-1e1aa62465b94ad8bff844f93d44c48c-ea-php74-php-fpm.service-Djg4uy 8.0K systemd-private-1e1aa62465b94ad8bff844f93d44c48c-ea-php74-php-fpm.service-W7Wy8Q ... so, what is it this directory php56-php.fpm.service of 6.3 G ? Why it's not automaticly cleared ? Can i delete it safely ? thank you and sorry for my noob question