<p>index.php :</p>
<p>"Hello World" is a string of characters.</p>
<p>A string of characters is text.</p>
<p>echo "Hello World" means prints the text onto the page.</p>
<pre><code class="lang-plaintext">&lt;!doctype html&gt;
&lt;html lang="en"&gt;
&lt;head&gt;
    &lt;meta charset="UTF-8"&gt;

    &lt;title&gt;Demo&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;h1&gt;
    &lt;?php
      echo "Hello World"
    ?&gt;
&lt;/h1&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>


index.php :

"Hello World" is a string of characters.

A string of characters is text.

echo "Hello World" means prints the text onto the page.

```plaintext
<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">

    <title>Demo</title>
</head>
<body>
<h1>
    <?php
      echo "Hello World"
    ?>
</h1>
</body>
</html>
```

My first php tag