title: Getting A non-numeric value when combining strings PHP
body: <p>I have this code:</p>
  <pre class="lang-php prettyprint-override"><code>echo &quot;&lt;p&gt;&quot; + $username + &quot;&lt;\/p&gt;&quot;
  </code></pre>
  <p>and <code>$username</code> is a string. I get this error:<br />
  <strong>Warning:</strong> A non-numeric value encountered<br />
  I don't know why i get this. How can i fix this?</p>