How to mix programming with php and c language

I heard from others that some projects use PHP as the foundation and C as the bottom layer. I am curious about how they worked together before? I know there is a way to write C as an extension library of PHP and call it in PHP? is that so?

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I heard from others that some projects use PHP as the foundation and C as the bottom layer. I am curious about how they worked together before? I know there is a way to write C as an extension library of PHP and call it in PHP? is that so?

Use C language to develop and expand applications suitable for computing-intensive business scenarios.

More often, it is based on the microservice architecture, developing an underlying unchanged system in C language, and exposing the tcp/http RPC interface to PHP. That is to use the Internet to achieve cross-language.