PHP 中的一些经验积累

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\'>\":\"\";