title: if statement with multiple condition in php
body: <p>I have if statement with multiple condition,<br>
  what is the differece between this two conditon:<br>
  1.  </p>
  
  <pre><code>    if($province=="AB" || "NT" || "NU" || "YT")
  {
      $GST=5;
  }
  else if($province=="BC" || "MB")
  {
      $GST=5;
      $PST=7;
  }
  else if($province=="NB" || "NF" || "ON")
  {
      $HST=13;
  }  
  </code></pre>
  
  <p>and second is:<br>
  2.  </p>
  
  <pre><code>if($province=="AB" || $province=="NT" || $province=="NU" || $province=="YT")
  {
      $GST=5;
  }
  else if($province=="BC" || $province=="MB")
  {
      $GST=5;
      $PST=7;
  }
  else if($province=="NB" || $province=="NF" || $province=="ON")
  {
      $HST=13;
  }
  </code></pre>