title: Fatal error: Call to undefined function mb_substr()
body: <p>I wanted to see your input on this concern I'm currently experiencing.
  It turns out that:</p>
  
  <pre><code> &lt;?php
  $disc_t=$name; 
    if(strlen($disc_t)&lt;=15)
    {
     $name_now=mb_substr( strip_tags($disc_t), 0, 10 ).'';
    }
    else
    {
     $name_now=mb_substr( strip_tags($disc_t), 0, 10).'...';
    }
  ?&gt;
  </code></pre>
  
  <p>is somehow giving me an error on the site, the error shows:</p>
  
  <pre><code>Fatal error: Call to undefined function mb_substr() in /home/(website)/public_html/index.php on line 308
  </code></pre>
  
  <p>I don't quite understand what they mean by <code>mb_substr</code>, is this a PHP version error?
  I am currently using PHP 5.3.19</p>