Определение IP на php

Для определения IP клиента на PHP я использую один из этих примеров.

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<?
function getIp()
{
	global $REMOTE_ADDR;
	global $HTTP_X_FORWARDED_FOR, $HTTP_X_FORWARDED, $HTTP_FORWARDED_FOR, $HTTP_FORWARDED;
	global $HTTP_VIA, $HTTP_X_COMING_FROM, $HTTP_COMING_FROM;
	global $HTTP_SERVER_VARS, $HTTP_ENV_VARS;
 
	// Get some server/environment variables values
	if (empty($REMOTE_ADDR)) {
		if (!empty($_SERVER) && isset($_SERVER['REMOTE_ADDR'])) {
			$REMOTE_ADDR = $_SERVER['REMOTE_ADDR'];
		}
		else if (!empty($_ENV) && isset($_ENV['REMOTE_ADDR'])) {
			$REMOTE_ADDR = $_ENV['REMOTE_ADDR'];
		}
		else if (!empty($HTTP_SERVER_VARS) && isset($HTTP_SERVER_VARS['REMOTE_ADDR'])) {
			$REMOTE_ADDR = $HTTP_SERVER_VARS['REMOTE_ADDR'];
		}
		else if (!empty($HTTP_ENV_VARS) && isset($HTTP_ENV_VARS['REMOTE_ADDR'])) {
			$REMOTE_ADDR = $HTTP_ENV_VARS['REMOTE_ADDR'];
		}
		else if (@getenv('REMOTE_ADDR')) {
			$REMOTE_ADDR = getenv('REMOTE_ADDR');
		}
	} // end if
 
	if (empty($HTTP_X_FORWARDED_FOR)) {
		if (!empty($_SERVER) && isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
			$HTTP_X_FORWARDED_FOR = $_SERVER['HTTP_X_FORWARDED_FOR'];
		}
		else if (!empty($_ENV) && isset($_ENV['HTTP_X_FORWARDED_FOR'])) {
			$HTTP_X_FORWARDED_FOR = $_ENV['HTTP_X_FORWARDED_FOR'];
		}
		else if (!empty($HTTP_SERVER_VARS) && isset($HTTP_SERVER_VARS['HTTP_X_FORWARDED_FOR'])) {
			$HTTP_X_FORWARDED_FOR = $HTTP_SERVER_VARS['HTTP_X_FORWARDED_FOR'];
		}
		else if (!empty($HTTP_ENV_VARS) && isset($HTTP_ENV_VARS['HTTP_X_FORWARDED_FOR'])) {
			$HTTP_X_FORWARDED_FOR = $HTTP_ENV_VARS['HTTP_X_FORWARDED_FOR'];
		}
		else if (@getenv('HTTP_X_FORWARDED_FOR')) {
			$HTTP_X_FORWARDED_FOR = getenv('HTTP_X_FORWARDED_FOR');
		}
	} // end if
 
	if (empty($HTTP_X_FORWARDED)) {
		if (!empty($_SERVER) && isset($_SERVER['HTTP_X_FORWARDED'])) {
			$HTTP_X_FORWARDED = $_SERVER['HTTP_X_FORWARDED'];
		}
		else if (!empty($_ENV) && isset($_ENV['HTTP_X_FORWARDED'])) {
			$HTTP_X_FORWARDED = $_ENV['HTTP_X_FORWARDED'];
		}
		else if (!empty($HTTP_SERVER_VARS) && isset($HTTP_SERVER_VARS['HTTP_X_FORWARDED'])) {
			$HTTP_X_FORWARDED = $HTTP_SERVER_VARS['HTTP_X_FORWARDED'];
		}
		else if (!empty($HTTP_ENV_VARS) && isset($HTTP_ENV_VARS['HTTP_X_FORWARDED'])) {
			$HTTP_X_FORWARDED = $HTTP_ENV_VARS['HTTP_X_FORWARDED'];
		}
		else if (@getenv('HTTP_X_FORWARDED')) {
			$HTTP_X_FORWARDED = getenv('HTTP_X_FORWARDED');
		}
	} // end if
 
	if (empty($HTTP_FORWARDED_FOR)) {
		if (!empty($_SERVER) && isset($_SERVER['HTTP_FORWARDED_FOR'])) {
			$HTTP_FORWARDED_FOR = $_SERVER['HTTP_FORWARDED_FOR'];
		}
		else if (!empty($_ENV) && isset($_ENV['HTTP_FORWARDED_FOR'])) {
			$HTTP_FORWARDED_FOR = $_ENV['HTTP_FORWARDED_FOR'];
		}
		else if (!empty($HTTP_SERVER_VARS) && isset($HTTP_SERVER_VARS['HTTP_FORWARDED_FOR'])) {
			$HTTP_FORWARDED_FOR = $HTTP_SERVER_VARS['HTTP_FORWARDED_FOR'];
		}
		else if (!empty($HTTP_ENV_VARS) && isset($HTTP_ENV_VARS['HTTP_FORWARDED_FOR'])) {
			$HTTP_FORWARDED_FOR = $HTTP_ENV_VARS['HTTP_FORWARDED_FOR'];
		}
		else if (@getenv('HTTP_FORWARDED_FOR')) {
			$HTTP_FORWARDED_FOR = getenv('HTTP_FORWARDED_FOR');
		}
	} // end if
 
	if (empty($HTTP_FORWARDED)) {
		if (!empty($_SERVER) && isset($_SERVER['HTTP_FORWARDED'])) {
			$HTTP_FORWARDED = $_SERVER['HTTP_FORWARDED'];
		}
		else if (!empty($_ENV) && isset($_ENV['HTTP_FORWARDED'])) {
			$HTTP_FORWARDED = $_ENV['HTTP_FORWARDED'];
		}
		else if (!empty($HTTP_SERVER_VARS) && isset($HTTP_SERVER_VARS['HTTP_FORWARDED'])) {
			$HTTP_FORWARDED = $HTTP_SERVER_VARS['HTTP_FORWARDED'];
		}
		else if (!empty($HTTP_ENV_VARS) && isset($HTTP_ENV_VARS['HTTP_FORWARDED'])) {
			$HTTP_FORWARDED = $HTTP_ENV_VARS['HTTP_FORWARDED'];
		}
		else if (@getenv('HTTP_FORWARDED')) {
			$HTTP_FORWARDED = getenv('HTTP_FORWARDED');
		}
	} // end if
 
	if (empty($HTTP_VIA)) {
		if (!empty($_SERVER) && isset($_SERVER['HTTP_VIA'])) {
			$HTTP_VIA = $_SERVER['HTTP_VIA'];
		}
		else if (!empty($_ENV) && isset($_ENV['HTTP_VIA'])) {
			$HTTP_VIA = $_ENV['HTTP_VIA'];
		}
		else if (!empty($HTTP_SERVER_VARS) && isset($HTTP_SERVER_VARS['HTTP_VIA'])) {
			$HTTP_VIA = $HTTP_SERVER_VARS['HTTP_VIA'];
		}
		else if (!empty($HTTP_ENV_VARS) && isset($HTTP_ENV_VARS['HTTP_VIA'])) {
			$HTTP_VIA = $HTTP_ENV_VARS['HTTP_VIA'];
		}
		else if (@getenv('HTTP_VIA')) {
			$HTTP_VIA = getenv('HTTP_VIA');
		}
	} // end if
 
	if (empty($HTTP_X_COMING_FROM)) {
		if (!empty($_SERVER) && isset($_SERVER['HTTP_X_COMING_FROM'])) {
			$HTTP_X_COMING_FROM = $_SERVER['HTTP_X_COMING_FROM'];
		}
		else if (!empty($_ENV) && isset($_ENV['HTTP_X_COMING_FROM'])) {
			$HTTP_X_COMING_FROM = $_ENV['HTTP_X_COMING_FROM'];
		}
		else if (!empty($HTTP_SERVER_VARS) && isset($HTTP_SERVER_VARS['HTTP_X_COMING_FROM'])) {
			$HTTP_X_COMING_FROM = $HTTP_SERVER_VARS['HTTP_X_COMING_FROM'];
		}
		else if (!empty($HTTP_ENV_VARS) && isset($HTTP_ENV_VARS['HTTP_X_COMING_FROM'])) {
			$HTTP_X_COMING_FROM = $HTTP_ENV_VARS['HTTP_X_COMING_FROM'];
		}
		else if (@getenv('HTTP_X_COMING_FROM')) {
			$HTTP_X_COMING_FROM = getenv('HTTP_X_COMING_FROM');
		}
	} // end if
 
	if (empty($HTTP_COMING_FROM)) {
		if (!empty($_SERVER) && isset($_SERVER['HTTP_COMING_FROM'])) {
			$HTTP_COMING_FROM = $_SERVER['HTTP_COMING_FROM'];
		}
		else if (!empty($_ENV) && isset($_ENV['HTTP_COMING_FROM'])) {
			$HTTP_COMING_FROM = $_ENV['HTTP_COMING_FROM'];
		}
		else if (!empty($HTTP_COMING_FROM) && isset($HTTP_SERVER_VARS['HTTP_COMING_FROM'])) {
			$HTTP_COMING_FROM = $HTTP_SERVER_VARS['HTTP_COMING_FROM'];
		}
		else if (!empty($HTTP_ENV_VARS) && isset($HTTP_ENV_VARS['HTTP_COMING_FROM'])) {
			$HTTP_COMING_FROM = $HTTP_ENV_VARS['HTTP_COMING_FROM'];
		}
		else if (@getenv('HTTP_COMING_FROM')) {
			$HTTP_COMING_FROM = getenv('HTTP_COMING_FROM');
		}
	} // end if
 
	// Gets the default ip sent by the user
	if (!empty($REMOTE_ADDR)) {
		$direct_ip = $REMOTE_ADDR;
	}
 
	// Gets the proxy ip sent by the user
	$proxy_ip = '';
	if (!empty($HTTP_X_FORWARDED_FOR)) {
		$proxy_ip = $HTTP_X_FORWARDED_FOR;
	} else if (!empty($HTTP_X_FORWARDED)) {
		$proxy_ip = $HTTP_X_FORWARDED;
	} else if (!empty($HTTP_FORWARDED_FOR)) {
		$proxy_ip = $HTTP_FORWARDED_FOR;
	} else if (!empty($HTTP_FORWARDED)) {
		$proxy_ip = $HTTP_FORWARDED;
	} else if (!empty($HTTP_VIA)) {
		$proxy_ip = $HTTP_VIA;
	} else if (!empty($HTTP_X_COMING_FROM)) {
		$proxy_ip = $HTTP_X_COMING_FROM;
	} else if (!empty($HTTP_COMING_FROM)) {
		$proxy_ip = $HTTP_COMING_FROM;
	} // end if... else if...
 
	// Returns the true IP if it has been found, else FALSE
	if (empty($proxy_ip)) {
		// True IP without proxy
		return $direct_ip;
	} else {
		$is_ip = ereg('^([0-9]{1,3}\.){3,3}[0-9]{1,3}', $proxy_ip, $regs);
		if ($is_ip && (count($regs) > 0)) {
		// True IP behind a proxy
		return $regs[0];
		} else {
			// Can't define IP: there is a proxy but we don't have
			// information about the true IP
			return FALSE;
		}
	} // end if... else...
 
} // end of the 'getIp()' function
 
echo getIp();
 
?>

или вот так

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<?
function validip($ip) {
	if (!empty($ip) && ip2long($ip)!=-1) {
		$reserved_ips = array (
			array('0.0.0.0','2.255.255.255'),
			array('10.0.0.0','10.255.255.255'),
			array('127.0.0.0','127.255.255.255'),
			array('169.254.0.0','169.254.255.255'),
			array('172.16.0.0','172.31.255.255'),
			array('192.0.2.0','192.0.2.255'),
			array('192.168.0.0','192.168.255.255'),
			array('255.255.255.0','255.255.255.255')
		);
 
		foreach ($reserved_ips as $r) {
			$min = ip2long($r[0]);
			$max = ip2long($r[1]);
			if ((ip2long($ip) >= $min) && (ip2long($ip) <= $max)) return false;
		}
 
		return true;
 
	} else {
		return false;
	}
} 
 
function getip() {
	if (validip(@$_SERVER["HTTP_CLIENT_IP"])) {
		return $_SERVER["HTTP_CLIENT_IP"];
	}
 
	foreach (explode(",",@$_SERVER["HTTP_X_FORWARDED_FOR"]) as $ip) {
		if (validip(trim($ip))) { return $ip; }
	}
 
	if (validip(@$_SERVER["HTTP_X_FORWARDED"])) {
		return $_SERVER["HTTP_X_FORWARDED"];
	} elseif (validip(@$_SERVER["HTTP_FORWARDED_FOR"])) {
		return $_SERVER["HTTP_FORWARDED_FOR"];
	} elseif (validip(@$_SERVER["HTTP_FORWARDED"])) {
		return $_SERVER["HTTP_FORWARDED"];
	} elseif (validip(@$_SERVER["HTTP_X_FORWARDED"])) {
		return $_SERVER["HTTP_X_FORWARDED"];
	} else {
		return $_SERVER["REMOTE_ADDR"];
	}
} 
 
echo getip();
 
?>
Short URL: http://ddev.ru/582/opredelenie-ip-na-php/