What are some common challenges faced when trying to display highlighted PHP code within a string on a website?

When trying to display highlighted PHP code within a string on a website, a common challenge is that the PHP code within the string may not be executed or highlighted properly. To solve this issue, you can use the `highlight_string` function in PHP to highlight the PHP code within the string before displaying it on the website. 

<?php
$string = '<?php echo "Hello, World!"; ?>';
highlight_string($string);
?>

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