What are some considerations for tracking and verifying the referrer URL in PHP to ensure the banner is displayed correctly?

When tracking and verifying the referrer URL in PHP to ensure the banner is displayed correctly, you should consider using the $_SERVER['HTTP_REFERER'] variable to get the referrer URL. You can then compare this URL with a list of allowed referrer URLs to ensure that the banner is only displayed on approved sites. Additionally, you may want to sanitize and validate the referrer URL to prevent any potential security vulnerabilities. 

$referrer = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] : '';

$allowed_referrers = array(
    'https://example.com',
    'https://www.example.com'
);

if(in_array($referrer, $allowed_referrers)){
    // Display the banner
    echo "<img src='banner.jpg' alt='Banner'>";
} else {
    // Do not display the banner
    echo "Banner not displayed on this site.";
}

Keywords

referrer URL tracking verifying PHP banner display

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