How can CSS be integrated into a PHP file for styling purposes?

To integrate CSS into a PHP file for styling purposes, you can use the `<style>` tag within the PHP file to define your CSS styles. This allows you to apply styles directly to the HTML elements generated by the PHP script. You can also link an external CSS file using the `<link>` tag to keep your styling separate from your PHP code.

&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Styling with CSS in PHP&lt;/title&gt;
    &lt;style&gt;
        body {
            font-family: Arial, sans-serif;
            background-color: #f0f0f0;
        }
        .container {
            width: 80%;
            margin: 0 auto;
            padding: 20px;
            background-color: #fff;
            border-radius: 5px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }
    &lt;/style&gt;
&lt;/head&gt;
&lt;body&gt;
    &lt;div class=&quot;container&quot;&gt;
        &lt;h1&gt;Welcome to my PHP page!&lt;/h1&gt;
        &lt;p&gt;This is a paragraph of text generated by PHP.&lt;/p&gt;
    &lt;/div&gt;
&lt;/body&gt;
&lt;/html&gt;