What are some common PHP commands used to gather information about visitors to a website?

To gather information about visitors to a website using PHP, you can utilize server variables such as $_SERVER['REMOTE_ADDR'] to get the visitor's IP address, $_SERVER['HTTP_USER_AGENT'] to get the user agent string, and $_SERVER['HTTP_REFERER'] to get the referring page. 

$ip_address = $_SERVER['REMOTE_ADDR'];
$user_agent = $_SERVER['HTTP_USER_AGENT'];
$referring_page = $_SERVER['HTTP_REFERER'];

echo "Visitor IP Address: " . $ip_address . "<br>";
echo "User Agent: " . $user_agent . "<br>";
echo "Referring Page: " . $referring_page . "<br>";

Keywords

PHP commands gather information visitors website

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