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What are some common pitfalls to avoid when integrating PHP functions within HTML elements like <link> tags?

One common pitfall to avoid when integrating PHP functions within HTML elements like <link> tags is not properly escaping the PHP code, which can lead to syntax errors or unexpected output. To solve this issue, it is important to use the PHP opening and closing tags within the HTML element and properly concatenate any PHP variables or functions.

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<link rel="stylesheet" type="text/css" href="<?php echo get_stylesheet_uri(); ?>">