ExampleService.php

<?php

class ExampleService
{
    //Dry Violation
    public function doThis(Example $example)
    {
        if (!$example->isAwesome()) {
            throw new NotAwesomeException("This is not an awesome example!");
        }
        
        //Do this
    }

    public function doThat(Example $example)
    {
        if (!$example->isAwesome()) {
            throw new NotAwesomeException("This is not an awesome example!");
        }
        
        //Do that
    }
    
    //Good example:
    public function doThis(Example $example)
    {
        $this->isAwesomeExample($example);
        
        //Do this
    }

    public function doThat(Example $example)
    {
        $this->isAwesomeExample($example);
        
        //Do that
    }
    
    private function isAwesomeExample(Example $example)
    {
        if (!$example->isAwesome()) {
            throw new NotAwesomeException("This is not an awesome example!");
        }
    }
}