What are some common pitfalls when setting quotation marks in PHP code within HTML?

When setting quotation marks in PHP code within HTML, a common pitfall is mixing up single and double quotation marks, which can lead to syntax errors. To avoid this issue, it is recommended to use single quotation marks for HTML attributes and double quotation marks for PHP strings within the HTML code. 

<?php
echo '<p class="example">This is a PHP string within HTML using single quotation marks for the attribute.</p>';
?>

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