What are the potential pitfalls of passing dynamic values through a link in PHP?

Passing dynamic values through a link in PHP can expose your application to security risks such as SQL injection attacks or cross-site scripting (XSS) attacks. To mitigate these risks, you should always sanitize and validate any user input before passing it through a link. One way to do this is by using PHP's built-in functions like htmlspecialchars() to escape special characters and prevent malicious code from being executed. 

<?php
// Sanitize and validate the dynamic value before passing it through a link
$dynamic_value = htmlspecialchars($_GET['dynamic_value']);

// Use the sanitized dynamic value in the link
echo '<a href="example.php?param=' . $dynamic_value . '">Link</a>';
?>

Keywords

XSS security vulnerability htmlentities htmlspecialchars validation

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