What are common issues that can arise when printing a webpage with PHP-generated content, such as disappearing elements in the print preview?

When printing a webpage with PHP-generated content, common issues can include disappearing elements in the print preview due to CSS styles not being applied correctly. To solve this, you can create a separate print stylesheet that includes all necessary styles for printing, such as setting elements to display:block or adjusting margins and padding.

// Example of including a separate print stylesheet in your PHP file
echo '<link rel="stylesheet" type="text/css" media="print" href="print.css">';