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<?php function anonIp($ip) { if (strpos($ip, ".") !== false) { $pieces = explode(".", $ip); $nPieces = count($pieces); $pieces[$nPieces - 1] = $pieces[$nPieces - 2] = "XXX"; return implode(".", $pieces); } else { $pieces = explode(":", $ip); $nPieces = count($pieces); $pieces[$nPieces - 1] = $pieces[$nPieces - 2] = "XXXX"; return implode(":", $pieces); } } var_dump(anonIp("207.142.131.005")); var_dump(anonIp("2001:0db8:0000:08d3:0000:8a2e:0070:7344")); var_dump(anonIp("207.142.131.5")); var_dump(anonIp("2001:0db8::8d3::8a2e:7:7344")); var_dump(anonIp("::1")); var_dump(anonIp("127.0.0.1"));

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