How can developers effectively manage CSS styling in PHP projects that utilize external frameworks?

When working on PHP projects that utilize external frameworks, developers can effectively manage CSS styling by organizing their stylesheets using a modular approach. This involves breaking down the CSS code into separate files based on components or sections of the website, making it easier to maintain and update. Additionally, developers can leverage the framework's built-in features, such as mixins or variables, to streamline the styling process and ensure consistency across the project.

// Example of organizing CSS files in a PHP project using external frameworks

// Create a folder for CSS files
$css_folder = 'css/';

// Include external framework CSS file
echo '<link rel="stylesheet" href="' . $css_folder . 'external-framework.css">';

// Include custom CSS files for different sections or components
$custom_css_files = array(
    'header.css',
    'sidebar.css',
    'footer.css'
);

foreach ($custom_css_files as $file) {
    echo '<link rel="stylesheet" href="' . $css_folder . $file . '">';
}