Use of the parameter 'status' to exit
<p>According to the <a href="http://php.net/manual/en/function.exit.php" rel="nofollow">documentation</a> to exit:</p>

<blockquote>
  <p>If status is an integer, that value will be used as the exit status and not printed.</p>
</blockquote>

<p>This made ​​me very confused. What is the difference between a <code>exit();</code> and a <code>exit(1);</code>? What are the use cases? How should I choose? On what occasions? How php manages this state?</p>
