Note I use the user vbox group staff to run my VM's so change this to suit your needs.
To use, copy the following into a filename of your choosing in /lib/svc/manifest/site and execute svcadm restart manifest-import
<?xml version="1.0" ?><!DOCTYPE service_bundle SYSTEM '/usr/share/lib/xml/dtd/service_bundle.dtd.1'><!-- Manifest created by svcbundle (2013-Nov-30 11:25:42+1100)--><service_bundletype="manifest"name="application/vboxwebserver"><serviceversion="1"type="service"name="application/vboxwebserver"><!-- The following dependency keeps us from starting until the multi-user milestone is reached. --><dependencyrestart_on="none"type="service"name="multi_user_dependency"grouping="require_all"><service_fmrivalue="svc:/milestone/multi-user"/></dependency><exec_methodtimeout_seconds="60"type="method"name="start"exec="/opt/VirtualBox/vboxwebsrv -b --logfile /export/home/vbox/vboxwebsrv.log"><method_context><method_credentialuser="vbox"group="staff"privileges="basic"/></method_context></exec_method><!-- The exec attribute below can be changed to a command that SMF should execute to stop the service. See smf_method(5) for more details. --><exec_methodtimeout_seconds="60"type="method"name="stop"exec=":kill"><method_context><method_credentialuser="vbox"group="staff"privileges="basic"/></method_context></exec_method><!-- The exec attribute below can be changed to a command that SMF should execute when the service is refreshed. Services are typically refreshed when their properties are changed in the SMF repository. See smf_method(5) for more details. It is common to retain the value of :true which means that SMF will take no action when the service is refreshed. Alternatively, you may wish to provide a method to reread the SMF repository and act on any configuration changes. --><exec_methodtimeout_seconds="60"type="method"name="refresh"exec=":true"><method_context><method_credentialuser="vbox"group="staff"privileges="basic"/></method_context></exec_method><instanceenabled="true"name="default"/><template><common_name><loctextxml:lang="C">VirtualBoxWebServer
</loctext></common_name><description><loctextxml:lang="C">StartstheVirtualBoxWebServerforphpVirtualBox
</loctext></description></template></service></service_bundle>
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As mentioned in https://sourceforge.net/p/phpvirtualbox/wiki/Home/#solaris you need to start vboxwebsrv for phpVirtualBox to work. For simplicity I made an SMF manifest to look after this.
Note I use the user vbox group staff to run my VM's so change this to suit your needs.
To use, copy the following into a filename of your choosing in /lib/svc/manifest/site and execute svcadm restart manifest-import