title: call to undefined function mb_strimwidth
body: <p>Months ago I made a short code that uses <code>mb_strimwidth()</code> to exactly fit some text into a table cell, putting dots at the end of a truncated string.
  Now, after some times, I tried to execute that same code and it went out with this error:</p>
  
  <pre><code>Fatal error: Call to undefined function mb_strimwidth() in ...
  </code></pre>
  
  <p>I tried to find the mbstring.php file, and when I found the <code>mb_strimwidth()</code> function, I discovered that it is not implemented anymore. How is that possible?
  But my main question is: how can I get the same result as <code>mb_strimwidth()</code>?
  I thought to rewrite the function using a loop and <code>mb_strwidth()</code>, but ALL the functions in that mbstring.php file are empty.</p>