title: Php Arabic characters are not concatenated correctly
body: <p>This is what I want to achieve:</p>
  
  <pre><code>تلر
  </code></pre>
  
  <p>This is the problem:</p>
  
  <pre><code>$a = "ت";
  $l = "ﻝ";
  $z = "ر";
  
  $word = $a.$l.$z;
  echo $word;
  </code></pre>
  
  <p>Prints: </p>
  
  <pre><code>ت‌ل‌ر 
  </code></pre>
  
  <p>while:</p>
  
  <pre><code>echo "تلر";
  </code></pre>
  
  <p>prints: </p>
  
  <pre><code>تلر
  </code></pre>
  
  <p>Actually there are no white-spaces but if you try this code (remember to allow utf-8) you will see that the letters won't combine. It works when the letters are combined directly. But as I combine then one by one like: <code>$a.$b.</code>... they wont combine.</p>
  
  <p>Any ideas how I could solve this?</p>