Flow Matrix

  Browser Database FS Application FS media Application Server CLI
Browser   N/A N/A N/A HTTP/HTTPS Requests N/A
Database N/A   N/A N/A Responses to SQL queries Responses to SQL queries
FS Application N/A N/A   N/A N/A N/A
FS media N/A N/A N/A   N/A N/A
Application Server HTTP Responses Run SQL queries Read PHP files, Write cache, Write log files Read and write media attached to products    
CLI N/A Run SQL queries Read PHP files, Write cache, Write log files Read and write media attached to products N/A