Php implements the rsa algorithm. how can this problem be solved?

Php has been practicing rsa algorithms for more than a month in the company. I am studying Php interns every day. but I am about to do my graduation thesis. I can't find any time. now I will share my questions: design and implementation of a secure Web service based on the public key cryptography system description: WEB servers are the core of enterprise network Intranet websites, and the data is very important, once damaged, php will implement the rsa algorithm for enterprises.
I have been an intern for more than a month in the company. I am a Php intern and I am studying every day. but I am about to do my graduation thesis. I can't find any time. now I will share my questions:
Design and implementation of secure Web services based on public key cryptography
Description:
The WEB server is the core of the enterprise network Intranet website. The data is very important. Once damaged, it will cause irreparable losses to the enterprise, managing, using, and protecting resources on WEB servers is a crucial task.
To ensure the security of Web services, you can use encrypted communication between the server and the browser. during communication, both parties can use digital certificates to confirm the identity of the other party.
Task:
1. familiar with the RSA algorithm in the public key cryptography system;
2. implement secure communication between the Web server and the browser through programming. the function must implement public key exchange between the two parties and implement encrypted transmission of all information;
3. the protocol analyzer can be used to capture and compare packets before and after encryption.
I want to use Php, but I don't know where to start,
I hope you can help me and brainstorm. please tell me any methods. thank you!

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Discussion
I have been an intern for more than a month in the company. I am a Php intern and I am studying every day. but I am about to do my graduation thesis. I can't find any time. now I will share my questions:
Design and implementation of secure Web services based on public key cryptography
Description:
The WEB server is the core of the enterprise network Intranet website. The data is very important. Once damaged, it will cause irreparable losses to the enterprise, managing, using, and protecting resources on WEB servers is a crucial task.
To ensure the security of Web services, you can use ......