[kh99]

You could create a plugin using hook parse_templates, and code like this:

ob_start();
phpinfo();
$phpinfo = ob_get_contents();
ob_end_clean();

vB_Template::preRegister('template_name', array('phpinfo' => $phpinfo));

Of course you want to change 'template_name' to the name of the template you want to insert the code in. Then in that template you can use

{vb:raw phpinfo}