Several php application skills

Php tips: PHP redirection 1. PHP redirection
1. PHP redirection
Method 1: header ("Location: index. php ");
Method 2: echo" Window. location = \ "$ PHP_SELF \"; ";
Method 3: echo" ";

2. obtain the visitor's browser
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;
}
// Call method $ browser = browseinfo (); directly return the result

3. obtain the visitor's operating system
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 ('netsd', $ Agent )){
$ OS = "NetBSD ";
}
Elseif (eregi ('bsd', $ Agent )){
$ OS = "BSD ";
}
Elseif (ereg ('oss1', $ Agent )){
$ OS = "OSF1 ";
}
Elseif (ereg ('irix ', $ Agent )){
$ OS = "IRIX ";
}
Elseif (eregi ('freebsd ', $ Agent )){
$ OS = "FreeBSD \";
}
If ($ OS = '') $ OS =" Unknown ";
Return $ OS;
}
// Call method $ OS = OS _infor ();

4. file format
$ 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-Forwarded Cr limit pt ',
'PDF '=> 'application/pdf ',
'Ps' => 'application/postscr reject pt ',
'Eps '=> 'application/postscr reject pt ',
'AI' => 'application/postscr reject pt ',
'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 ',

'Av' => '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-uencode ',
'Uuue' => 'text/x-uencode ',

'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. generate an excel file in php
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 ";
?>
// You can change the corresponding file header to export file formats such as .doc. xls.
6. time comparison problems
For example, a forum marks a post posted on the day with a new image.
Method 1:
// $ Db-> rows [$ I] [date] indicates the datetime field value in the database.
$ Today = time ();
$ TheDay = date ("Y-m-d H: I: s", $ today-24*3600 );
$ NewTag = $ db-> rows [$ I] [date]> = $ theDay? "":"";
Method 2:
$ NewTag = $ db-> rows [$ I] [date]> = date ("Y-m-d 00:00:00 ")? "