title: Fzaninotto/Faker IF statement when generating fake data
body: <p>I am currently trying to fake seed quite a vast table of mine. I am currently using Laravel 4.1.</p>
  
  <p>I have one column which is set to NULL, because it only has to be filled if the previous column is set to '1', for example.</p>
  
  <p>I currently have:</p>
  
  <pre><code>$alerts = 
  [[
      'user_id' =&gt; $i,
      'reference' =&gt; $faker-&gt;sentence($nbWords = 1),
      'type' =&gt; rand(1,2),
      'category' =&gt; rand(1,4),
      'headline' =&gt; $faker-&gt;sentence($nbWords = 2),
      'description' =&gt; $faker-&gt;realText(150)               
  ]];
  </code></pre>
  
  <p>So, should <strong>'type'</strong> be '1', I want the following two fields 'range_to' and 'range_from' to be then faked. </p>
  
  <p>Is this possible logically? Any pointers would be hugely appreciated.</p>