title: How to change HTML file to PHP
body: <p>I have an HTML file with HTML code. How can I change from the HTML file to a PHP file?</p>
  
  <p>The following is the HTML code:</p>
  
  <pre><code>&lt;html&gt;
      &lt;head&gt;
          &lt;title&gt;Instascan – Demo&lt;/title&gt;
          &lt;link rel="stylesheet" href="style.css"&gt;
          &lt;script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/webrtc-adapter/3.3.3/adapter.min.js"&gt;&lt;/script&gt;
          &lt;script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.1.10/vue.min.js"&gt;&lt;/script&gt;
          &lt;script type="text/javascript" src="https://rawgit.com/schmich/instascan-builds/master/instascan.min.js"&gt;&lt;/script&gt;
      &lt;/head&gt;
  
      &lt;body&gt;
          &lt;div id="app"&gt;
              &lt;div class="sidebar"&gt;
                  &lt;section class="scans"&gt;
                      &lt;h2&gt;Scans&lt;/h2&gt;
                      &lt;ul v-if="scans.length === 0"&gt;
                          &lt;li class="empty"&gt;No scans yet&lt;/li&gt;
                      &lt;/ul&gt;
                      &lt;transition-group name="scans" tag="ul"&gt;
                          &lt;li v-for="scan in scans" :key="scan.date" :title="scan.content"&gt;{{ scan.content }}&lt;/li&gt;
                      &lt;/transition-group&gt;
                  &lt;/section&gt;
              &lt;/div&gt;
              &lt;div class="preview-container"&gt;
                  &lt;video id="preview"&gt;&lt;/video&gt;
              &lt;/div&gt;
          &lt;/div&gt;
          &lt;script type="text/javascript" src="app.js"&gt;&lt;/script&gt;
      &lt;/body&gt;
  
  &lt;/html&gt;
  </code></pre>