get phpVirtualBox 5.0.5 running with VirtualBox 5.2.x

• If you haven’t already, upgrade to phpVirtualBox 5.0.5.
• Open file "endpoints/lib/config.php" on your phpvirtualbox installation in an editor of your choice.
• Change the line "define('PHPVBOX_VER', ...) as following:
  define('PHPVBOX_VER', '5.2-0');
• Download SDK for VirtualBox 5.2 from https://www.virtualbox.org/wiki/Downloads
• Extract the SDK-archive contents somewhere.
• Copy the files "bindings/webservice/vboxweb.wsdl" and "bindings/webservice/vboxwebService.wsdl" of the SDK to the folder "endpoints/lib" of your phpvirtualbox installation and rename the files as "vboxweb-5.2.wsdl" and "vboxwebService-5.2.wsdl"
• Edit the file "vboxwebService-5.2.wsdl" with an editor. Change the line
  "<import location="vboxweb.wsdl" namespace="http://www.virtualbox.org/"/>"
  to:
  <import location="vboxweb-5.2.wsdl" namespace="http://www.virtualbox.org/"/>
• Restart the vboxweb-Service AND your webserver:
  service vboxweb-service restart
service apache2 restart

If this still doesn’t work, try rebooting the host machine. This sometimes fixed VB-issues magically if one has just upgraded or installed VB.