PHP How to judge access IP _php Tutorial

How PHP judges access to IP

This article mainly introduces PHP to determine the method of access to IP, involving PHP for server-side predefined variable $_server related judgment and use of skills, the need for friends can refer to the following

The example in this paper describes how PHP judges access to IP. Share to everyone for your reference. Specific as follows:

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function getIP() { if (! empty ( $_SERVER ["HTTP_CLIENT_IP"] )) { $cip = $_SERVER ["HTTP_CLIENT_IP"]; } else if (! empty ( $_SERVER ["HTTP_X_FORWARDED_FOR"] )) { $cip = $_SERVER ["HTTP_X_FORWARDED_FOR"]; } else if (! empty ( $_SERVER ["REMOTE_ADDR"] )) { $cip = $_SERVER ["REMOTE_ADDR"]; } else { $cip = ''; } preg_match ( "/[\d\.]{7,15}/", $cip, $cips ); $cip = isset ( $cips [0] ) ? $cips [0] : 'unknown'; unset ( $cips ); return $cip; } ?>

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