What are some common PHP functions or variables used to gather visitor information?

One common way to gather visitor information in PHP is by using the $_SERVER superglobal array. This array contains information about the server environment, including details about the visitor's browser, IP address, and referrer. By accessing specific keys within the $_SERVER array, you can retrieve valuable information about the visitor accessing your website. 

// Get the visitor's IP address
$visitor_ip = $_SERVER['REMOTE_ADDR'];

// Get the visitor's browser information
$visitor_browser = $_SERVER['HTTP_USER_AGENT'];

// Get the referrer URL
$referrer_url = $_SERVER['HTTP_REFERER'];

// Print out the gathered information
echo "Visitor IP: " . $visitor_ip . "<br>";
echo "Visitor Browser: " . $visitor_browser . "<br>";
echo "Referrer URL: " . $referrer_url . "<br>";

Keywords

$_SERVER $_GET $_POST $_COOKIE $_SESSION

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