1、关于PHP重定向
方法一：header("Location: index.php");
方法二：echo "<script>window.location ="$PHP_SELF";</script>";
方法三：echo "<META HTTP-EQUIV="Refresh" CONTENT="0; URL=index.php">";

2、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

3、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() ;

4、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-javascript\'\',
\'\'pdf\'\' => \'\'application/pdf\'\',
\'\'ps\'\' => \'\'application/postscript\'\',
\'\'eps\'\' => \'\'application/postscript\'\',
\'\'ai\'\' => \'\'application/postscript\'\',
\'\'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\'\',
);
5、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
6、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?"<img src=\'\'../image/newinfor.gif\'\'>":"";
方法二：
$newTag=$db->rows[$i][date]>=date("Y-m-d 00:00:00")?"<img src=\'\'../image/newinfor.gif\'\'>":"";