About html, php and angularjs!!

Question

I just wanna build a web application,

 

this application is using html, php and angularjs but some php code doesn't work when mixed with angularjs. this is the example

<input type="text" name="nama" ng-model="nama" value="<?php $nama='nama'; echo $nama; ?>"/>

 but, the value doesn't apeared...

please help me how to fix it??