Php-how to improve the performance of PHP projects

The company has a PHP project, but it finds that the concurrent access volume and security of the project are not very good when going online. now the boss gives me the task, let me see if there is any way to improve the concurrency of the project in java, but I have been working for more than a year and I am not very familiar with the performance, the nginx + apache + php mentioned in the online query can increase the concurrency, but I use nginx as a proxy, but the test performance is not very satisfactory. thank you very much for your guidance !!! Performance php concurrency

The company has a PHP project, but it finds that the concurrent access traffic and security of the project are not very good when it is going online. now the boss gives me the task
Let me see if there is any way to improve the concurrency of the project in java, but I have been working for more than a year and I am not very familiar with the performance,
The nginx + apache + php mentioned in the online query can increase the concurrency, but I use nginx as a proxy, but the test performance is not ideal,
Thank you very much for your guidance !!!