php积累的一些技巧

1、关于PHP重定向
方法一：header("Location: index.php");
方法二：echo "";
方法三：echo "";

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' => 'p_w_picpath/gif',
 'jpg' => 'p_w_picpath/jpeg',
 'jpeg' => 'p_w_picpath/jpeg',
 'jpe' => 'p_w_picpath/jpeg',
 'bmp' => 'p_w_picpath/bmp',
 'png' => 'p_w_picpath/png',
 'tif' => 'p_w_picpath/tiff',
 'tiff' => 'p_w_picpath/tiff',
 'pict' => 'p_w_picpath/x-pict',
 'pic' => 'p_w_picpath/x-pict',
 'pct' => 'p_w_picpath/x-pict',
 'tif' => 'p_w_picpath/tiff',
 'tiff' => 'p_w_picpath/tiff',
 'psd' => 'p_w_picpath/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' => 'p_w_picpath/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?"":"";

//方法二：
$newTag=$db->rows[$i][date]>=date("Y-m-d 00:00:00")?"":"";
?>

再增加一个正规表达式例子(自动转化www,ftp,mail开头的链接)
function enable_url($str)
{
 $str = ereg_replace("( www.[a-zA-Z0-9@:%_.~#-\ ?&]+)", " \\1", $str); // 自动转化www开头的链接
 $str = ereg_replace("(((f|ht){1}tp://)[a-zA-Z0-9@:%_.~#-\?&]+)", " \\1\ " target=\"_blank\">\\1", $str); //转化http://开头和ftp://开头的链接
 $str = str_replace('linkHttp://','http://',$str);
 $str = ereg_replace("([_\.0-9a-z-]+@([0-9a-z][0-9a-z-]+\.)+[a-z]{2,3})"," \\1 mailto:\\1\">\\1 >", $str); // 转化邮件地址
 return $str;
}
//for example
echo enable_url(" [url]www.snowai.com[/url] ");
?>