php获取本地IP

function get_local_ip() {
	$preg = "/\A((([0-9]?[0-9])|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5]))\.){3}(([0-9]?[0-9])|(1[0-9]{2})|(2[0-4][0-9])|(25[0-5]))\Z/";
	//获取操作系统为win2000/xp、win7的本机IP真实地址
	exec("ipconfig", $out, $stats);
	if (!empty($out)) {
		foreach ($out AS $row) {
			if (strstr($row, "IP") && strstr($row, ":") && !strstr($row, "IPv6")) {
				$tmpIp = explode(":", $row);
				if (preg_match($preg, trim($tmpIp[1]))) {
					return trim($tmpIp[1]);
				}
			}
		}
	}
	//获取操作系统为linux类型的本机IP真实地址
	exec("ifconfig", $out, $stats);
	if (!empty($out)) {
		if (isset($out[1]) && strstr($out[1], 'addr:')) {
			$tmpArray = explode(":", $out[1]);
			$tmpIp = explode(" ", $tmpArray[1]);
			if (preg_match($preg, trim($tmpIp[0]))) {
				return trim($tmpIp[0]);
			}
		}
	}
	return '127.0.0.1';
}