What are the potential implications of displaying variables in the address bar when passing them through a link in PHP?

Displaying variables in the address bar when passing them through a link in PHP can pose a security risk as it exposes sensitive information to users and potentially malicious actors. To mitigate this risk, you can use POST method instead of GET method to pass variables through links, which will keep the data hidden from the address bar.

<form action="target_page.php" method="post">
    <input type="hidden" name="variable_name" value="variable_value">
    <button type="submit">Submit</button>
</form>