What are the potential errors or issues that can arise when using PHP to display text based on a specific GET parameter in the URL?

One potential issue that can arise is that the GET parameter may not be properly sanitized, leading to security vulnerabilities such as cross-site scripting (XSS) attacks. To mitigate this risk, it is important to properly sanitize and validate the GET parameter before using it to display text on the page. 

<?php
// Sanitize and validate the GET parameter before using it
$parameter = isset($_GET['parameter']) ? htmlspecialchars($_GET['parameter']) : '';

// Display the sanitized parameter
echo $parameter;
?>

Keywords

PHP GET parameter URL XSS error handling

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