SPF CHECKER it a very simple application that scan domains and save their spf into a file.
FIRST YOU NEED TO INSTALL THIS COMPONENT OR NOTHING WILL WORK
yum -y install bind-utils;
after that place your spf folder in your html directory and give the folder that permission by this command: chmod 755 -R YOUR DIRECTORY
then configure the path to htpwd in htaccess or simply remove it the default login and password is admin:12345
You can also check domains manually:
tested in centos/apache/php7.3