title: string length of tricky string in php
body: <p>I have two strings like this</p>
  
  <pre><code>$text = 'Abcdef';
  $text[7] = 'Ghijk';
  </code></pre>
  
  <p>When I take the length of <code>$text</code> by </p>
  
  <pre><code>echo strlen($text);
  </code></pre>
  
  <p>The answer is <code>8</code>. Can Any body describe how is it?</p>