title: How to draw mathematic pattern in php?
body: <p>I want to draw a pattern like this.</p>
  
  <pre><code>1
  2 3
  3 5 8
  5 8 13 21
  8 13 21 34 55
  </code></pre>
  
  <p>Can somebody help me?
  like in php code for this pattern is</p>
  
  <pre><code>1
  12
  123
  1234
  12345
  </code></pre>
  
  <p>is</p>
  
  <pre><code>&lt;?php
      for($i=1;$i&lt;=5;$i++) {
          for($j=1;$j&lt;=$i;$j++) {
              echo $j;
          }
          echo "&lt;/br&gt;";
      }
  ?&gt;
  </code></pre>