In Selenium IDE for PHPunit, You need to install a PHP formatter plugin.

Install this formatter plugin https://addons.mozilla.org/en-US/firefox/addon/selenium-ide-php-formatters/

– Go to Options
– On General tab Select “Enable experimental features”
– Save the ide and close
– Restart the IDE.

– Record some sessions
– Click on File menu
– Export testcase as PHPUnit or you can Enable formatter PHPunit