1、关于php重定向

 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 "test1\t";
echo "test2\t\n";
echo "test1\t";
echo "test2\t\n";
echo "test1\t";
echo "test2\t\n";
echo "test1\t";
echo "test2\t\n";
echo "test1\t";
echo "test2\t\n";
echo "test1\t";
echo "test2\t\n";
?>
//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>":"";