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As mentioned in the PHP manual, PHP process control supports Unix-based process creation, program execution, signal processing, and process interruption. Process control cannot be applied to the Web server environment. When it is used in the Web service environment, unexpected results may occur. PCNTL cannot be used in WEB Services... mentioned in the PHP manual:

PHP process control supports Unix Process Creation, program execution, signal processing, and process interruption. Process control cannot be applied to the Web server environment. When it is used in the Web service environment, unexpected results may occur.
PCNTL cannot be used on WEB servers... Since PHP cannot be used on web servers, where can this situation be used?
Client ??

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Mentioned in the PHP manual:

PHP process control supports Unix Process Creation, program execution, signal processing, and process interruption. Process control cannot be applied to the Web server environment. When it is used in the Web service environment, unexpected results may occur.
PCNTL cannot be used on WEB servers... Since PHP cannot be used on web servers, where can this situation be used?
Client ??

For example, you can use multi-process processing or service-type code to process data scripts.

There are four PHP running modes:

1) cgi Common Gateway Interface ))
2) fast-cgi resident (long-live) type CGI
3) cli Command Line Interface)
4) web module mode (module mode for running apache and other web servers)

The subject should understand the fourth type.