What are some common issues with CSS compatibility in different browsers when using PHP?

One common issue with CSS compatibility in different browsers when using PHP is the need to add vendor prefixes to CSS properties for certain browsers that do not fully support the latest CSS standards. To solve this, you can use a CSS preprocessor like Autoprefixer to automatically add the necessary vendor prefixes to your CSS code.

// Example of using Autoprefixer with PHP
$css = file_get_contents('styles.css');
$autoprefixer = new Autoprefixer();
$prefixed_css = $autoprefixer->compile($css);
file_put_contents('styles.prefixed.css', $prefixed_css);