print difference between 2 strings in php
<p>I have an output stream that is saved in a string called $output1, this is displayed to the user. now if I have another stream called $output2 that is identical to $output1 plus a few lines, how can I output only the part of $output 2 that is not in $output1.</p>

<p>For example:</p>

<pre><code>$output1="this cat is";  
$output2="this cat is mine";  
</code></pre>

<p>I want to output:</p>

<blockquote>
  <p>this cat is mine</p>
</blockquote>
