Problems with Pcntl in PHP. Great God, come in.

Mentioned in the PHP manual:

PHP's Process control supports the implementation of UNIX-style process creation, program execution, signal processing, and process interruption. Process Control cannot be applied in a Web server environment and can have unexpected results when it is used in a Web service environment.
Pcntl cannot be used on Web servers ... Since PHP cannot be used in a Web server, then where is this situation?
Client??

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Mentioned in the PHP manual:

PHP's Process control supports the implementation of UNIX-style process creation, program execution, signal processing, and process interruption. Process Control cannot be applied in a Web server environment and can have unexpected results when it is used in a Web service environment.
Pcntl cannot be used on Web servers ... Since PHP cannot be used in a Web server, then where is this situation?
Client??

For example, in a script that handles data, you can use multi-process processing or a service-type code.

PHP has 4 modes of operation:

1) CGI Universal Gateway Interface (Common Gateway Interface))
2) fast-cgi resident (long-live) type CGI
3) CLI command line run (Interface)
4) Web module mode (module mode for Web server running like Apache)

The master should know the fourth kind

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