What are the potential pitfalls of mixing CSS and PHP code in a web development project?

Mixing CSS and PHP code in a web development project can lead to messy and hard-to-maintain code. It can also make it difficult to separate the presentation layer from the logic layer, which can hinder code reusability and scalability. To solve this issue, it's best to keep CSS and PHP code separate by using external CSS files and PHP includes for dynamic content. 

// Example of separating CSS and PHP code

// In your HTML file
<link rel="stylesheet" type="text/css" href="styles.css">

// In your PHP file
<?php include 'header.php'; ?>

Keywords

CSS PHP code mixing security vulnerabilities performance impact

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