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 "<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-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"）;
echo "test1 ";
echo "test2 ";
echo "test1 ";
echo "test2 ";
echo "test1 ";
echo "test2 ";
echo "test1 ";
echo "test2 ";
echo "test1 ";
echo "test2 ";
echo "test1 ";
echo "test2 ";
？>
//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