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1. Site-specific:
   1. PFE_CORE_HOST
   2. PFE_CORE_FOLDER
2. Database variables:
   1. PFE_DAT_DRIVER
   2. PFE_DAT_HOST
   3. PFE_DAT_PORT
   4. PFE_DAT_USR
   5. PFE_DAT_PW
   6. PFE_DAT_DBNAME
   7. PFE_DAT_DBPREFIX
3. Cache configurations
   1. PFE_CACHE_DRIVER
   2. PFE_CACHE_HOST
   3. PFE_CACHE_PORT
   4. PFE_CACHE_AUTH_USR
   5. PFE_CACHE_AUTH_PW
4. Mail sending configurations:
   1. PFE_MAIL_PROVIDER
   2. PFE_MAIL_FROM_NAME
   3. PFE_MAIL_FROM_EMAIL
   4. PFE_MAIL_SMTP_HOST
   5. PFE_MAIL_SMTP_USR
   6. PFE_MAIL_SMTP_PW
   7. PFE_MAIL_SMTP_PORT
   8. PFE_MAIL_SMTP_ENCRYPTION
   9. PFE_MAIL_IS_SMTP_AUTH
5. License
   1. PFE_LICENSE_ID
   2. PFE_LICENSE_KEY
6. Site Info and Admin
   1. PFE_SITE_NAME
   2. PFE_SITE_ADMIN
   3. PFE_SITE_PW
7. Some other settings:
   1. PFE_IS_SHORT_URL
   2. PFE_IS_FORCE_EMAIL_VER
   3. PFE_RECAPT_SITE_KEY
   4. PFE_RECAPT_SECRET
   5. PFE_RECAPT_TYPE (2 or 3)

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