function GetIP() { //获取IP

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;

}

?>

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;

}

?>

PHP重定向

方法一：header("Location: index.php");

方法二：echo "window.location ="$PHP_SELF";";

方法三：echo "";

?>

获取访问者浏览器

function browse_infor()

{

$browser="";$browserver="";

$Browsers =array("Lynx","MOSAIC","AOL","Opera","JAVA","MacWeb","WebExplorer","OmniWeb");

$Agent = $GLOBALS["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))

{

$temp =explode("(", $Agent); $Part=$temp[0];

$temp =explode("/", $Part); $browserver=$temp[1];

$temp =explode(" ",$browserver); $browserver=$temp[0];

$browserver =preg_replace("/([d.]+)/","1",$browserver);

$browserver = " $browserver";

$browser = "Netscape Navigator";

}

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);

$browserver = " $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);

$browserver = " $browserver";

$browser = "Internet Explorer";

}

if ($browser!="")

{

$browseinfo = "$browser$browserver";

}

else

{

$browseinfo = "Unknown";

}

return $browseinfo;

}

//调用方法$browser=browseinfo() ;直接返回结果

?>

获取访问者操作系统

function osinfo() {

$os="";

$Agent = $GLOBALS["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',$Agent) && eregi('nt',$Agent)) {

$os="Windows NT";

}

elseif (eregi('win',$Agent) && eregi('nt 5.1',$Agent)) {

$os="Windows XP";

}

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;

}

//调用方法$os=os_infor() ;

?>

文件格式类

$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',

);

?>

php生成excel文档

header("Content-type:application/vnd.ms-excel");

header("Content-Disposition:filename=test.xls");

echo "test1t";

echo "test2tn";

echo "test1t";

echo "test2tn";

echo "test1t";

echo "test2tn";

echo "test1t";

echo "test2tn";

echo "test1t";

echo "test2tn";

echo "test1t";

echo "test2tn";

//改动相应文件头就可以输出.doc .xls等文件格式了

?>

时间比较问题

举一个简单例子说明:比如一个论坛对当天发表的贴子用new图片标记一下。

方法一：

//$db->rows[$i][date]中为数据库中datetime字段值.

$today=time();

$theDay=date("Y-m-d H:i:s",$today-24*3600);

$newTag=$db->rows[$i][date]>=$theDay?"":"";

//方法二：

$newTag=$db->rows[$i][date]>=date("Y-m-d 00:00:00")?"":"";

?>

//提取页面和浏览器提交的变量，作用相当于使PHP.INI开了全局变量

@extract($_SERVER, EXTR_SKIP);

@extract($_SESSION, EXTR_SKIP);

@extract($_POST, EXTR_SKIP);

@extract($_FILES, EXTR_SKIP);

@extract($_GET, EXTR_SKIP);

@extract($_ENV, EXTR_SKIP);

?>

//读取文件函数

function readfromfile($file_name) {

if (file_exists($file_name)) {

$filenum=fopen($file_name,"r");

flock($filenum,LOCK_EX);

$file_data=fread($filenum, filesize($file_name));

rewind($filenum);

fclose($filenum);

return $file_data;

}

}

?>

//写入文件函数

function writetofile($file_name,$data,$method="w") {

$filenum=fopen($file_name,$method);

flock($filenum,LOCK_EX);

$file_data=fwrite($filenum,$data);

fclose($filenum);

return $file_data;

}

?>