获取浏览器IP地址

　　function getRemoteIPAddress() {

　　$ip = $_SERVER['REMOTE_ADDR'];

　　return $ip;

　　}

　　如果有代理服务器的情况下获取IP

　　function getRealIPAddress() {

　　if (!empty($_SERVER['HTTP_CLIENT_IP'])) { // check ip from share internet

　　$ip = $_SERVER['HTTP_CLIENT_IP'];

　　} elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) { // to check ip is pass from proxy

　　$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];

　　} else {

　　$ip = $_SERVER['REMOTE_ADDR'];

　　}

　　return $ip;

　　}

　　获取 MySQL 时间戳

　　$query = "select UNIX_TIMESTAMP(date_field) as mydate from mytable where 1=1";

　　$records = mysql_query($query) or die(mysql_error());

　　while($row = mysql_fetch_array($records)) {

　　echo $row;

　　}

　　验证日期格式：YYYY-MM-DD

　　function checkDateFormat($date) {

　　// match the format of the date

　　if (preg_match("/^([0-9]{4})-([0-9]{2})-([0-9]{2})$/", $date, $parts)) {

　　// check whether the date is valid of not

　　if (checkdate($parts[2], $parts[3], $parts[1])) {

　　return true;

　　} else {

　　return false;

　　}

　　} else {

　　return false;

　　}

　　}

　　重定向

　　header('Location: http://www.php100.com');

　　发送邮件

　　$to = "someone@oschina.net";

　　$subject = "Your Subject here";

　　$body = "Body of your message here you can use HTML too. e.g.
Bold ";

　　$headers = "From: You\r\n";

　　$headers .= "Reply-To: info@yoursite.com\r\n";