title: Concatenate two integers in php
body: <p>I know it is possible in php to concatenate two strings like</p>
  
  <pre><code>$a .= $b;
  </code></pre>
  
  <p>which is equal to </p>
  
  <pre><code>$a = $a . $b;
  </code></pre>
  
  <p>Is it possible to do something with integers? but with math operations? I have two variables:</p>
  
  <pre><code>$var1 = 8;
  $var2 = 2;
  </code></pre>
  
  <p>I need to do <code>$var1 - $var2</code>, but I don't want to create third variable to hold this calculation. I would try <code>$var1 = $var1 + $var2</code> will this work? Is there another <code>.=</code> similar way of doing it?</p>