//获取IP zuolo:由于防火墙的原因 REMOTE_ADDR 就是服务器外网IP
<?
function GetIP() {
    if ($_SERVER["HTTP_X_FORWARDED_FOR"])
        $ip = $_SERVER["HTTP_X_FORWARDED_FOR"];
    else if ($_SERVER["HTTP_CLIENT_IP"])
        $ip = $_SERVER["HTTP_CLIENT_IP"];
    else if ($_SERVER["REMOTE_ADDR"])
        $ip = $_SERVER["REMOTE_ADDR"];
    else if (getenv("HTTP_X_FORWARDED_FOR"))
        $ip = getenv("HTTP_X_FORWARDED_FOR");
    else if (getenv("HTTP_CLIENT_IP"))
        $ip = getenv("HTTP_CLIENT_IP");
    else if (getenv("REMOTE_ADDR"))
        $ip = getenv("REMOTE_ADDR");
    else
        $ip = "Unknown";
    return $ip;
}
?>

<?php
function DateAdd($date, $int, $unit = "d") { //时间的增加（还可以改进成时分秒都可以增加，有时间再补上）
    $dateArr = explode("-", $date);
    $value[$unit] = $int;
    return date("Y-m-d", mktime(0,0,0, $dateArr[1] + $value['m'], $dateArr[2] + $value['d'], $dateArr[0] + $value['y']));
}

function GetWeekDay($date) { //计算出给出的日期是星期几
    $dateArr = explode("-", $date);
    return date("w", mktime(0,0,0,$dateArr[1],$dateArr[2],$dateArr[0]));
}
?>

<?
function check_date($date) { //检查日期是否合法日期
    $dateArr = explode("-", $date);
    if (is_numeric($dateArr[0]) && is_numeric($dateArr[1]) && is_numeric($dateArr[2])) {
        return checkdate($dateArr[1],$dateArr[2],$dateArr[0]);
    }
    return false;
}
function check_time($time) { //检查时间是否合法时间
    $timeArr = explode(":", $time);
    if (is_numeric($timeArr[0]) && is_numeric($timeArr[1]) && is_numeric($timeArr[2])) {
        if (($timeArr[0] >= 0 && $timeArr[0] <= 23) && ($timeArr[1] >= 0 && $timeArr[1] <= 59) && ($timeArr[2] >= 0 && $timeArr[2] <= 59))
            return true;
        else
            return false;
    }
    return false;
}

function DateDiff($date1, $date2, $unit = "") { //时间比较函数，返回两个日期相差几秒、几分钟、几小时或几天
    switch ($unit) {
        case 's':
            $dividend = 1;
            break;
        case 'i':
            $dividend = 60;
            break;
        case 'h':
            $dividend = 3600;
            break;
        case 'd':
            $dividend = 86400;
            break;
        default:
            $dividend = 86400;
    }
    $time1 = strtotime($date1);
    $time2 = strtotime($date2);
    if ($time1 && $time2)
        return (float)($time1 - $time2) / $dividend;
    return false;
}

?>

<?
方法一：header("Location: index.php");
方法二：echo "<scrīpt>window.location ="$PHP_SELF";</scrīpt>";
方法三：echo "<META HTTP-EQUIV="Refresh" CONTENT="0; URL=index.php">";

?>

<?
//获取访问者浏览器
function browse_infor()
{
    $browser="";$browserver="";
    $Browsers =array("Lynx","MOSAIC","AOL","Opera","JAVA","MacWeb","WebExplorer","OmniWeb");
    $Agent = $_SERVER["HTTP_USER_AGENT"];
    for ($i=0; $i<=7; $i++)    {
        if (strpos($Agent,$Browsers[$i]))    {
        $browser = $Browsers[$i];
        $browserver ="";
        }
    }
//    if (ereg("Mozilla",$Agent) && !ereg("MSIE",$Agent))    { bug：会把谷歌浏览器Chrome误认为Netscape Navigator
//        $temp =explode("(", $Agent); $Part=$temp[0];
//        $temp =explode("/", $Part); $browserver=$temp[1];
//        $temp =explode(" ",$browserver); $browserver=$temp[0];
//        $browserver =preg_replace("/([d.]+)/","1",$browserver);
//        $browser = "Netscape Navigator";
//    }
    if (ereg("Mozilla",$Agent) && ereg("Chrome",$Agent))    {
        $browserver=substr($Agent,strripos($Agent, "Chrome"));
        $browserver=substr($browserver,7,(strripos($browserver," ")-7));
        $browser = "Google Chrome";
    }
    if (ereg("Mozilla",$Agent) && ereg("Opera",$Agent))    {
        $temp =explode("(", $Agent); $Part=$temp[1];
        $temp =explode(")", $Part); $browserver=$temp[1];
        $temp =explode(" ",$browserver);$browserver=$temp[2];
        $browserver =preg_replace("/([d.]+)/","1",$browserver);
        $browser = "Opera";
    }
    if (ereg("Mozilla",$Agent) && ereg("MSIE",$Agent))    {
        $temp = explode("(", $Agent); $Part=$temp[1];
        $temp = explode(";",$Part); $Part=$temp[1];
        $temp = explode(" ",$Part);$browserver=$temp[2];
        //$browserver =preg_replace("/([d.]+)/","1",$browserver); bug：在IE7中会把版本号7.0转为710
        $browser = "Internet Explorer";
    }
    if ($browser!="")    {
        $browseinfo = "$browser $browserver";
    }
    else    {
        $browseinfo = "Unknown";
    }
    return $browseinfo;
}

function osinfo() {
    $os="";
    $Agent = $_SERVER["HTTP_USER_AGENT"];
    if (eregi('win',$Agent) && strpos($Agent, '95')) {
        $os="Windows 95";
    }
    elseif (eregi('win 9x',$Agent) && strpos($Agent, '4.90')) {
        $os="Windows ME";
    }
    elseif (eregi('win',$Agent) && ereg('98',$Agent)) {
        $os="Windows 98";
    }
    elseif (eregi('win',$Agent) && eregi('nt 5.0',$Agent)) {
        $os="Windows 2000";
    }
    elseif (eregi('win',$Agent) && eregi('nt 5.1',$Agent)) {
        $os="Windows XP";
    }
    elseif (eregi('win',$Agent) && eregi('nt 6.0',$Agent)) {
        $os="Windows Vista";
    }
    elseif (eregi('win',$Agent) && eregi('nt',$Agent)) {
        $os="Windows NT";
    }
    elseif (eregi('win',$Agent) && ereg('32',$Agent)) {
        $os="Windows 32";
    }
    elseif (eregi('linux',$Agent)) {
        $os="Linux";
    }
    elseif (eregi('unix',$Agent)) {
        $os="Unix";
    }
    elseif (eregi('sun',$Agent) && eregi('os',$Agent)) {
        $os="SunOS";
    }
    elseif (eregi('ibm',$Agent) && eregi('os',$Agent)) {
        $os="IBM OS/2";
    }
    elseif (eregi('Mac',$Agent) && eregi('PC',$Agent)) {
        $os="Macintosh";
    }
    elseif (eregi('PowerPC',$Agent)) {
        $os="PowerPC";
    }
    elseif (eregi('AIX',$Agent)) {
        $os="AIX";
    }
    elseif (eregi('HPUX',$Agent)) {
        $os="HPUX";
    }
    elseif (eregi('NetBSD',$Agent)) {
        $os="NetBSD";
    }
    elseif (eregi('BSD',$Agent)) {
        $os="BSD";
    }
    elseif (ereg('OSF1',$Agent)) {
        $os="OSF1";
    }
    elseif (ereg('IRIX',$Agent)) {
        $os="IRIX";
    }
    elseif (eregi('FreeBSD',$Agent)) {
        $os="FreeBSD";
    }
    if ($os=='') $os = "Unknown";
    return $os;
}

<?
$mime_types = array(
'gif' => 'image/gif',
'jpg' => 'image/jpeg',
'jpeg' => 'image/jpeg',
'jpe' => 'image/jpeg',
'bmp' => 'image/bmp',
'png' => 'image/png',
'tif' => 'image/tiff',
'tiff' => 'image/tiff',
'pict' => 'image/x-pict',
'pic' => 'image/x-pict',
'pct' => 'image/x-pict',
'tif' => 'image/tiff',
'tiff' => 'image/tiff',
'psd' => 'image/x-photoshop',

'swf' => 'application/x-shockwave-flash',
'js' => 'application/x-javascrīpt',
'pdf' => 'application/pdf',
'ps' => 'application/postscrīpt',
'eps' => 'application/postscrīpt',
'ai' => 'application/postscrīpt',
'wmf' => 'application/x-msmetafile',

'css' => 'text/css',
'htm' => 'text/html',
'html' => 'text/html',
'txt' => 'text/plain',
'xml' => 'text/xml',
'wml' => 'text/wml',
'wbmp' => 'image/vnd.wap.wbmp',

'mid' => 'audio/midi',
'wav' => 'audio/wav',
'mp3' => 'audio/mpeg',
'mp2' => 'audio/mpeg',

'avi' => 'video/x-msvideo',
'mpeg' => 'video/mpeg',
'mpg' => 'video/mpeg',
'qt' => 'video/quicktime',
'mov' => 'video/quicktime',

'lha' => 'application/x-lha',
'lzh' => 'application/x-lha',
'z' => 'application/x-compress',
'gtar' => 'application/x-gtar',
'gz' => 'application/x-gzip',
'gzip' => 'application/x-gzip',
'tgz' => 'application/x-gzip',
'tar' => 'application/x-tar',
'bz2' => 'application/bzip2',
'zip' => 'application/zip',
'arj' => 'application/x-arj',
'rar' => 'application/x-rar-compressed',

'hqx' => 'application/mac-binhex40',
'sit' => 'application/x-stuffit',
'bin' => 'application/x-macbinary',

'uu' => 'text/x-uuencode',
'uue' => 'text/x-uuencode',

'latex'=> 'application/x-latex',
'ltx' => 'application/x-latex',
'tcl' => 'application/x-tcl',

'pgp' => 'application/pgp',
'asc' => 'application/pgp',
'exe' => 'application/x-msdownload',
'doc' => 'application/msword',
'rtf' => 'application/rtf',
'xls' => 'application/vnd.ms-excel',
'ppt' => 'application/vnd.ms-powerpoint',
'mdb' => 'application/x-msaccess',
'wri' => 'application/x-mswrite',
);

?>