intellij-plugin/Edu-Php/resources/Edu-Php.xml

<idea-plugin>
  <dependencies>
    <plugin id="com.jetbrains.php"/>
  </dependencies>

  <extensions defaultExtensionNs="Educational">
    <configurator implementationClass="com.jetbrains.edu.php.PhpConfigurator" language="PHP" displayName="PHP"/>
  </extensions>
</idea-plugin>