PHP经验集锦

最近刚刚完成手中的项目，比较闲。来这儿转转，把积累的一些技巧分享给大家！
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\.]+)/",");

$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\.]+)/",");

$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\.]+)/",");

$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'>":"";



7.数据库封装例子



<?php

//------------------------------------------------------------------------------------------

// ※Database()                   构造函数，数据库初始参数

// ※Select()                     查询

// ※GetRows()                    返回查询的记录总数

// ※Insert()                     插入记录

// ※Update()                     更新

// ※Delete()                     删除

// ※Halt()                       中断并显示错误信息*/

//------------------------------------------------------------------------------------------

 define("DATABASETYPE","1");       //定义数据库类型:1为MySql;2为SQL Server;3为Oracle;4为Odbc

 define("SERVER","localhost");     //Host name or IP address of the database server

 define("DATABASE","dbName");   //要连接的数据库名

 define("USER","tableName");     //用于连接数据库的用户名

 define("PASSWORD","paswd");    //用于连接数据库的密码  

 

class Database{

 var $dbLink;                      //连接句柄

 var $result;                      //查询句柄

 var $insId;                       //Insert()成功返回AUTO_INCREMENT列的值

 var $rows;                        //返回数据数组

 var $numRows;                     //返回数据数目

 var $dbHost, $dbUser, $userPassword, $database;

 var $dbType=DATABASETYPE;

 var $msgFlag = "yes" ;            //yes:show the Mysql message ; no: die by show "Halted."

 function Database($dbHost=SERVER,$dbUser=USER,$userPassword=PASSWORD,$database=DATABASE){

   switch($this->dbType){

     case 1:

      $this->dbLink=@mysql_pconnect($dbHost,$dbUser,$userPassword);// or die("Can't Connect to Remote Host!");

      @mysql_select_db($database,$this->dbLink);// or die ("Can't Connect to Remote Host!");

      break;

    case 2:

      break;   

  }

   return true;

 }

 

 /*SQL:Select() 返回为false无结果*/

 function Select($table,$columns,$condition=1){

  $sql="select $columns from $table where $condition ";  

  //echo $sql."<br>";   

  $this->result=@mysql_query($sql,$this->dbLink);  

  unset($this->rows);

  if($this->result){

   $i=0;

   if(!($this->rows=array("$i"=>@mysql_fetch_array($this->result))))

    return false;

   if(($this->numRows=@mysql_num_rows($this->result))==0)

    return false;

   while()){

    array_push($this->rows,$tempRows);

   }      

  }else{

   $this->Halt($sql);

   return false;

  }  

  return true;

 }

 

 /*SQL:GetRows() 返回查询的记录总数*/

 function GetRows($table,$condition=1){

  $sql="select count(1) as count from $table where $condition";  

  //echo $sql."<br>";      

  $this->result=@mysql_query($sql,$this->dbLink);    

  if($this->result){

   );

   $this->numRows=$temp[count];

  }else{

   $this->Halt($sql);

   return false;

  }  

  return $this->numRows;

 }

  

 /*SQL:Insert()*/

  

 function Insert($table,$columns,$values){

  $sql="insert into $table ($columns) values ($values)";

  //echo $sql;

  $this->result=@mysql_query($sql,$this->dbLink);

  if ($this->result)

    $this->insId=@mysql_insert_id($this->dbLink);

   else{

   $this->Halt($sql);

   return false;

  }

  return true;

 }



 /*SQL:Update()*/

  

 function Update($table,$setings,$condition){

  $sql="update $table set $setings where $condition";

  //echo $sql;

  $this->result=@mysql_query($sql,$this->dbLink);

  if ($this->result)

    $this->numRows=@mysql_affected_rows($this->result);

   else{

   $this->Halt($sql);

   return false;

  }

  return true;

 }



 /*SQL:Delete*/

 

 function Delete($table,$condition){

  $sql="delete from $table where $condition";

  $this->result=@mysql_query($sql,$this->dbLink);

  if ($this->result)

     $this->numRows=@mysql_affected_rows($this->result);

   else{

   $this->Halt($sql);

   return false;

  }  

   

  return true;

 }

 

 /*Halt():error message */

 

 function Halt($msg){

  if($this->msgFlag=="yes"){

   printf("<b>Database Query Error:</b> %s<br>\n", $msg);

   printf("<b>MySql Error:</b> %s<br>\n",mysql_error());

  }else

   echo "<META HTTP-EQUIV=REFRESH CONTENT='0;URL=../include/error.htm'>";//自定一个出错提示文件

    return false;

 }

} 

  switch($db->dbType){

   case 1:

     @mysql_close();    

    break;

  case 2:

     

    break;   

  } 

  $db = new Database();

?>