How can PHP scripts be integrated into HTML files for form submissions?

To integrate PHP scripts into HTML files for form submissions, you can use the PHP code within the HTML file by enclosing it in <?php ?> tags. You can set the form action to the PHP script that will handle the form submission, and use PHP variables to retrieve and process form data.

&lt;?php
if ($_SERVER[&quot;REQUEST_METHOD&quot;] == &quot;POST&quot;) {
    $name = $_POST[&#039;name&#039;];
    $email = $_POST[&#039;email&#039;];
    
    // Process form data here
    
    // Redirect to a thank you page
    header(&quot;Location: thank_you.php&quot;);
    exit();
}
?&gt;

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Form Submission&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;form method=&quot;post&quot; action=&quot;&lt;?php echo htmlspecialchars($_SERVER[&quot;PHP_SELF&quot;]);?&gt;&quot;&gt;
        Name: &lt;input type=&quot;text&quot; name=&quot;name&quot;&gt;&lt;br&gt;
        Email: &lt;input type=&quot;email&quot; name=&quot;email&quot;&gt;&lt;br&gt;
        &lt;input type=&quot;submit&quot; value=&quot;Submit&quot;&gt;
    &lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;