When building a SAAS platform, what are the disadvantages of using PHP as the backend?

Background
1. Currently working on a SAAS product, mainly in the field of experimental science
2. In order to develop the backend more quickly, PHP was chosen

Problems
1. As the number of users increases, what problems may you encounter
2. How to deal with the problem

Currently, we are also looking for experts to work together, you can contact me

Reply content:

Background
1. Currently working on a SAAS product, mainly in the field of experimental science
2. In order to develop the backend more quickly, PHP was chosen

Problems
1. As the number of users increases, what problems may you encounter
2. How to deal with the problem

Currently, we are also looking for experts to work together, you can contact me

1 PHP will encounter maintenance problems in the later stage, and if you use some frameworks, it will bring performance problems
2 Using java or golang, the maintenance and performance are better than PHP