PHP extension Development How to reference other extended functions

PHP has a number of extensions, such as the PDO extension, that encapsulate some of the operations on the relational library. and PHP can also develop its own extensions.

So, how do you use other extended functions in the extensions you develop?

For example, to develop a DLL extension, the function will use the PDO extension of some functions, the question is how to reference the function of PDO?

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PHP has a number of extensions, such as the PDO extension, that encapsulate some of the operations on the relational library. and PHP can also develop its own extensions.

So, how do you use other extended functions in the extensions you develop?

For example, to develop a DLL extension, the function will use the PDO extension of some functions, the question is how to reference the function of PDO?

I think this is unrealistic, you know, each extension is independent from other extensions, each extension does not affect each other, the extension just provides the php interface for layer invocation, you can only call the extension on the php level of the method, it is not wise to invoke other extensions inside the extension,

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