How can the $_SERVER[] variables in PHP be utilized to determine the ISP of the client?

To determine the ISP of the client using PHP, we can utilize the $_SERVER['REMOTE_ADDR'] variable to get the IP address of the client. Then, we can use a third-party API or service that provides ISP information based on the IP address to retrieve the ISP details. 

$ip = $_SERVER['REMOTE_ADDR'];
$isp_details = file_get_contents("http://ip-api.com/json/{$ip}");
$isp_details = json_decode($isp_details);

$isp = $isp_details->isp;

echo "ISP of the client: " . $isp;

Keywords

$_SERVER PHP ISP client variables

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