What are the best practices for styling text output in PHP using CSS?

When styling text output in PHP using CSS, it is best practice to separate the styling from the content by using external CSS files. This allows for easier maintenance and better organization of your code. Additionally, using classes and IDs to target specific elements for styling is recommended for a more efficient and scalable approach.

<!DOCTYPE html>
<html>
<head>
    <link rel="stylesheet" type="text/css" href="styles.css">
</head>
<body>
    <?php
    echo '<p class="my-text">This is a styled text output in PHP using CSS!</p>';
    ?>
</body>
</html>
```

styles.css
```css
.my-text {
    color: red;
    font-size: 20px;
    font-weight: bold;
}