PHP 升級後都會自動改成 session owner 回原本設定,
網路建議是為 owner 另建子資料夾對應, 下次就不會被更動.
user = nginx
; Set session path to a directory owned by process user
php_value[session.save_handler] = files
php_value[session.save_path] = /var/lib/php/nginx/session
php_value[soap.wsdl_cache_dir] = /var/lib/php/nginx/wsdlcache
ref: https://serverfault.com/questions/582483/php-upgrade-always-breaks-session-folder-permissions
