Single vs Double quotes in PHP?
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/3446216/difference-between-single-quote-and-double-quote-string-in-php">Difference between single quote and double quote string in php</a>  </p>
</blockquote>



<p>what is the difference between these two lines in PHP?</p>

<pre><code>$text = preg_replace('/\r\n/', '\n', $text);
$text = preg_replace('/\r\n/', "\n", $text);
</code></pre>

<p>I just want to know how can we distinguish the difference between break line and paragraph entered in a form via PHP?</p>
