几个php应用技巧

　　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<scrīpt>window.location=\$PHP_SELF\;</scrīpt>;
方法三：echo<METAHTTP-EQUIV=\Refresh\CONTENT=\0;URL=index.php\>;

2、获取访问者浏览器
functionbrowse_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;
$browser=NetscapeNavigator;
}
if(ereg(Mozilla,$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;
$browser=InternetExplorer;
}
if($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
functionosinfo(){
$os=;
$Agent=$GLOBALS[HTTP_USER_AGENT];
if(eregi(win,$Agent)&&strpos($Agent,95)){
$os=Windows95;
}
elseif(eregi(win9x,$Agent)&&strpos($Agent,4.90)){
$os=WindowsME;
}
elseif(eregi(win,$Agent)&&ereg(98,$Agent)){
$os=Windows98;
}
elseif(eregi(win,$Agent)&&eregi(nt5\.0,$Agent)){
$os=Windows2000;
}
elseif(eregi(win,$Agent)&&eregi(nt,$Agent)){
$os=WindowsNT;
}
elseif(eregi(win,$Agent)&&eregi(nt5\.1,$Agent)){
$os=WindowsXP;
}
elseif(eregi(win,$Agent)&&ereg(32,$Agent)){
$os=Windows32;
}
elseif(eregi(linux,$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)){
$os=IBMOS/2;
}
elseif(eregi(Mac,$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-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,
);
5、php生成excel文档
<?
header(Content-type:application/vnd.ms-excel);
header(Content-Disposition:filename=test.xls);
echotest1\t;
echotest2\t\n;
echotest1\t;
echotest2\t\n;
echotest1\t;
echotest2\t\n;
echotest1\t;
echotest2\t\n;
echotest1\t;
echotest2\t\n;
echotest1\t;
echotest2\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();
$theDay=date(Y-m-dH:i:s,$today-24*3600);
$newTag=$db->rows[$i][date]>=$theDay?<imgsrc=../image/newinfor.gif>:;
方法二：
$newTag=$db->rows[$i][date]>=date(Y-m-d00:00:00)?<imgsrc=../image/newinfor