Who installed too many apache servers on one window ??

Recently, I encountered some very old php (php5.3.x) web platforms and installed them on my computer (self-built server environment, not integrated environment) php version is very high (php5.6.x ). As a result, running on my computer causes various error messages !! Just change the version... recently, I encountered some very old php (php5.3.x) web platforms and installed them on my computer (self-built server environment, not integrated environment) php version is very high (php5.6.x ).

As a result, running on my computer causes various error messages !!

As long as the version is reduced, no error will occur.

However, when the version is reduced, it is found that the running speed is also greatly reduced (the website response speed is reduced too much ).

I feel a little outweighs the loss (greatly reducing my work efficiency ).

Therefore, I suddenly thought: if multiple apache servers are installed on my computer and different versions of php are integrated on each server, if the old version is used, the old version of apache will be used, if the new version is used, the new version is also used.

In this way, perfect is used, right ??

I have used multiple servers on my computer, but various problems may occur during actual operation, such:
What is the problem of ssl and various paths that may occur in apache? is the virtual host invalid ??
Php will see that the mb_string module is enabled (the module path is also set: extension_dir), but this module cannot be loaded (The same is true for other modules)

Unless you simply use the single network directory under/Apache/htdoc/, use the default php settings (and cannot be set at all ).

I don't know which of the following things have actually been put into practice. so far, there are still multiple apache servers hanging on windows computers ??