title: Case insensitive string comparison
body: <p>I would like to compare two variables to see if they are the same, but I want this comparison to be case-insensitive.</p>
  
  <p>For example, this would be case sensitive:</p>
  
  <pre><code>if($var1 == $var2){
     ...
  }
  </code></pre>
  
  <p>But I want this to be case insensitive, how would I approach this?</p>