put this into: /etc/avahi/services/phpmp.service

<?xml version="1.0" standalone='no'?>
<!DOCTYPE service-group SYSTEM "avahi-service.dtd">
<service-group>
 <name replace-wildcards="yes">%h music player remote</name>
 <service>
   <type>_http._tcp</type>
   <port>80</port>
   <txt-record>path=/phpmp/</txt-record>
 </service>
</service-group>