You can install a machine agent on a node that runs the PHP Agent. However, note that if you install the machine agent on a PHP Agent node and you specify the tier and node name in the controller-info.xml file of the machine agent, the PHP Agent will not successfully register with the Controller.

To avoid this problem:

• Install the PHP Agent before you install the machine agent
• If you install the machine agent on the machine hosting the instrumented PHP node, do not specify the application, tier or node name in the controller-info.xml file of the machine agent. If you do, the PHP Agent may fail to register.