PHP CGI differs from CLI

  When running in CGI, Web server transfers the user request to the PHP standalone process in a message, with no dependency between PHP and the Web service, and the CLI is a command line interface for executing PHP in the operating system command-line mode. For example, you can directly enter the PHP a.php directly in the win CMD or Linux shell mode to get the results. It is the most different from the CGI mode is not output HTTP header information (CGI mode in addition to output users can see the results, but also output the HTTP header information that the user cannot see directly), the information thrown directly in the text and not in HTML, such as a new test.php.
For the time being, we don't know  what CGI and CLI are.

PHP CGI differs from CLI