php积累的一些技巧

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xieyu 2008-01-07 09:50:57 博主文章分类：PHP

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' => '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?"<img src='../p_w_picpath/newinfor.gif'>":"";

//方法二：
$newTag=$db->rows[$i][date]>=date("Y-m-d 00:00:00")?"<img src='../p_w_picpath/newinfor.gif'>":"";
?>

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@:%_.~#-\?&]+)", " <a href=\"linkHttp://\\1\" target=\"_blank\">\\1</a>", $str); // 自动转化www开头的链接
$str = ereg_replace("(((f|ht){1}tp://)[a-zA-Z0-9@:%_.~#-\?&]+)", "<a href=\"\\1\" target=\"_blank\">\\1</a>", $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})","<a href=\"\\1mailto:\\1\">\\1</a>", $str); // 转化邮件地址
return $str;
}
//for example
echo enable_url("[url]www.snowai.com[/url]");
?>