In response to your comment:
I would want to show CR within the PHP website
CR being a Windows executable, this will not be directly possible (aside from embedding a Remote Desktop or VNC instance, but this is probably not feasible, and would not be legal.)
Your best bet is to check whether CR has an export format that can be embedded into the web site: PDF, HTML, XML come to mind. Those you could insert into your web page manually.
If you want automated interaction between the web site's user and CR, this probably possible, but not going to be trivial. There are third party products that allow controlling CR from the command line. You may be possible to set up an interaction between PHP and Crystal Reports through the command line on a Windows server, but it's going to be a lot of work.