图片操作类的完整代码。

<?php 
/* 
$img = new Image('pic.jpg'); 
//$img->changeSize(80,50);//改变尺寸 
$img->changeSize(80);//改变尺寸 
$img->create(); 
$img->free(); 
$img = new Image('pic.jpg'); 
$img->addWatermark('logo.jpg', 50); //添加水印，第一个参数是水印的图片地址，第二个参数是透明值 
$img->create(); 
$img->free(); 
site http://www.
*/ 
class Image { 
    var $imageResource = NULL; 
    var $target = NULL; 
    var $enableTypes = array(); 
    var $imageInfo = array(); 
    var $createFunc = ''; 
    var $imageType = NULL; 
     
    /* Construct for this class 
     * @param string $image 
     * @return Image 
     */ 
    function Image($image = NULL) { 
        //get enables 
        if(imagetypes() & IMG_GIF) { 
            $this->enableTypes[] = 'image/gif'; 
        } 
        if(imagetypes() & IMG_JPEG) { 
            $this->enableTypes[] = 'image/jpeg'; 
        } 
        if (imagetypes() & IMG_JPG) { 
            $this->enableTypes[] = 'image/jpg'; 
        } 
        if(imagetypes() & IMG_PNG) { 
            $this->enableTypes[] = 'image/png'; 
        } 
        //end get 
         
        if($image != NULL) { 
            $this->setImage($image); 
        } 
    } 
     
    /* set a image resource 
     * @param string $image 
     * @return boolean 
     */ 
    function setImage($image) { 
        if(file_exists($image) && is_file($image)) { 
            $this->imageInfo = getimagesize($image); 
            $img_mime = strtolower()($this->imageInfo['mime']); 
            if(!in_array($img_mime, $this->enableTypes)) { 
                exit('系统不能操作这种图片类型.'); 
            } 
            switch ($img_mime) { 
                case 'image/gif': 
                    $link = imagecreatefromgif($image); 
                    $this->createFunc = 'imagegif'; 
                    $this->imageType = 'gif'; 
                    break; 
                case 'image/jpeg': 
                case 'image/jpg': 
                    $link = imagecreatefromjpeg($image); 
                    $this->createFunc = 'imagejpeg'; 
                    $this->imageType = 'jpeg'; 
                    break; 
                case 'image/png': 
                    $link = imagecreatefrompng($image); 
                    $this->createFunc = 'imagepng'; 
                    $this->imageType = 'png'; 
                    break; 
                default: 
                    $link = 'unknow'; 
                    $this->imageType = 'unknow'; 
                    break; 
            } 
            if($link !== 'unknow') { 
                $this->imageResource = $link; 
            } else { 
                exit('这种图片类型不能改变尺寸.'); 
            } 
            unset($link); 
            return true; 
        } else { 
            return false; 
        } 
    } 
     
    /*set header*/ 
    function setHeader() { 
        switch ($this->imageType) { 
            case 'gif': 
                header('content-type:image/gif'); 
                break; 
            case 'jpeg': 
                header('content-type:image/jpeg'); 
                break; 
            case 'png': 
                header('content-type:image/png'); 
                break; 
            default: 
                exit('Can not set header.'); 
                break; 
        } 
        return true; 
    } 
     
    /* change the image size 
     * @param int $width 
     * @param int $height 
     * @return boolean 
     */ 
    function changeSize($width, $height = -1) { 
        if(!is_resource($this->imageResource)) { 
            exit('不能改变图片的尺寸,可能是你没有设置图片来源.'); 
        } 
        $s_width = $this->imageInfo[0]; 
        $s_height = $this->imageInfo[1]; 
        $width = intval($width); 
        $height = intval($height); 
         
        if($width <= 0) exit('图片宽度必须大于零.'); 
        if($height <= 0) { 
            $height = ($s_height / $s_width) * $width; 
        } 
         
        $this->target = imagecreatetruecolor($width, $height); 
        if(@imagecopyresized($this->target, $this->imageResource, 0, 0, 0, 0, $width, $height, $s_width, $s_height)) 
            return true; 
        else 
            return false; 
    } 
     
    /* Add watermark 
     * @param string $image 
     * @param int $app 
     */ 
    function addWatermark($image, $app = 50) { 
        if(file_exists($image) && is_file($image)) { 
            $s_info = getimagesize($image); 
        } else { 
            exit($image . '文件不存在.'); 
        } 
        $r_width = $s_info[0]; 
        $r_height = $s_info[1]; 
        if($r_width > $this->imageInfo[0]) exit('水印图片必须小于目标图片'); 
        if($r_height > $this->imageInfo[1]) exit('水印图片必须小于目标图片'); 
         
        switch ($s_info['mime']) { 
            case 'image/gif': 
                $resource = imagecreatefromgif($image); 
                break; 
            case 'image/jpeg': 
            case 'image/jpg': 
                $resource = imagecreatefromjpeg($image); 
                break; 
            case 'image/png': 
                $resource = imagecreatefrompng($image); 
                break; 
            default: 
                exit($s_info['mime'] .'类型不能作为水印来源.'); 
                break; 
        } 
         
        $this->target = &$this->imageResource; 
        imagecopymerge($this->target, $resource, $this->imageInfo[0] - $r_width - 5, 
$this->imageInfo[1] - $r_height - 5, 0,0 ,$r_width, $r_height, $app); 
        imagedestroy($resource); 
        unset($resource); 
    } 
     
    /* create image 
     * @param string $name 
     * @return boolean 
     */ 
    function create($name = NULL) { 
        $function = $this->createFunc; 
        if($this->target != NULL && is_resource($this->target)) { 
            if($name != NULL) { 
                $function($this->target, $name); 
            } else { 
                $function($this->target); 
            } 
            return true; 
        } else if($this->imageResource != NULL && is_resource($this->imageResource)) { 
            if($name != NULL) { 
                $function($this->imageResource, $name); 
            } else { 
                $function($this->imageResource); 
            } 
            return true; 
        } else { 
            exit('不能创建图片,原因可能是没有设置图片来源.'); 
        } 
    } 
     
    /*free resource*/ 
    function free() { 
        if(is_resource($this->imageResource)) { 
            @imagedestroy($this->imageResource); 
        } 
        if(is_resource($this->target)) { 
            @imagedestroy($this->target); 
        } 
    } 
} 
?>

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php 分页代码。

<?php
/**
#---------------
#获取序列ID
#---------------
*/
function getSequence() {
$sql = "update sequence set id=last_insert_id(id+1);";
$sql2= "select last_insert_id();";
global $dbuser,$dbpass,$host,$database,$printsql;
$link = mysql_connect()($host,$dbuser,$dbpass);
if(! $link){
  return mysql_error();
}
mysql_select_db($database);
mysql_query()("SET NAMES UTF8"); 
if($printsql) echo "<hr/>".$sql."<hr/>";
mysql_query($sql);
if($printsql) echo "<hr/>".$sql2."<hr/>";
$result = mysql_query($sql2);
if(mysql_num_rows($result)==0){
  mysql_close($link);
  return "";
}
$myrow = mysql_fetch_row($result);
$ret=$myrow[0];
mysql_close($link);
return $ret;
}
#---------------
#获取strSql第N条记录中的第N列数据,下标从1开始
#---------------
function getData($strsql,$row,$col) {
global $dbuser,$dbpass,$host,$database,$printsql;
$link = mysql_connect($host,$dbuser,$dbpass);
if(! $link){
  return mysql_error();
}
mysql_select_db($database);
mysql_query("SET NAMES UTF8"); 
if($printsql) echo "<hr/>".$strsql."<hr/>";
$result = mysql_query($strsql);
if(mysql_num_rows($result)==0){
  mysql_close($link);
  return "";
}
$i=0;
while($myrow = mysql_fetch_row($result)){
   if($i==$row-1){
      $ret=$myrow[$col-1];
      break;
   }
   $i=$i+1;
}
mysql_close($link);
return $ret;
}
#---------------
#获取strSql第N条记录
#---------------
function getRowData($strsql,$row) {
global $dbuser,$dbpass,$host,$database,$printsql;
$link = mysql_connect($host,$dbuser,$dbpass);
if(! $link){
  return mysql_error();
}
mysql_select_db($database);
mysql_query("SET NAMES UTF8"); 
if($printsql) echo "<hr/>".$strsql."<hr/>";
$result = mysql_query($strsql);
if(mysql_num_rows($result)==0){
  mysql_close($link);
  return "";
}
$i=0;
while($myrow = mysql_fetch_array($result)){
   if($i==$row-1){
      $ret=$myrow;
      break;
   }
   $i=$i+1;
}
mysql_close($link);
return $ret;
}
#---------------
#获取strSql记录集存入数组中
#---------------
function getResultSetData($strsql) {
global $dbuser,$dbpass,$host,$database,$printsql;
$link = mysql_connect($host,$dbuser,$dbpass);
if(! $link){
  return mysql
_error();
}
mysql_select_db($database);
mysql_query("SET NAMES UTF8"); 
if($printsql) echo "<hr/>".$strsql."<hr/>";
$result = mysql_query($strsql);
if(mysql_num_rows($result)==0){
  mysql_close($link);
  return "";
}
while($myrow = mysql_fetch_array($result)){
      $ret[]=$myrow;     
}
mysql_close($link);
return $ret;
}
#---------------
#执行strSql
#---------------
function executeSql($strsql) {
global $dbuser,$dbpass,$host,$database,$printsql;
$link = mysql_connect($host,$dbuser,$dbpass);
if(! $link){
  return mysql_error();
}
mysql_select_db($database);
mysql_query("SET NAMES UTF8"); 
if($printsql) echo "<hr/>".$strsql."<hr/>";
mysql_query($strsql);
$ret =mysql_affected_rows($link);
mysql_close($link);
return $ret;
}
/*
 分页
*/
 function Pager(&$curpage,&$pagesize,&$tsql,&$psql,&$totalpage,&$totalrow,&$pagerset){
 $curpage=isset()($curpage)?intval($curpage):1;//当前页
 $totalpage=0;//总页数
 $totalrow=0;//总记录数
 if($printsql) echo "<hr/>".$tsql."<hr/>";
 if($curpage <= 0){
   $curpage=1;
 }
 
 $totalrow=getData($tsql,1,1);//取得总记录数
 $totalrow=strlen(totalrow)==0?0:$totalrow; 
 if($totalrow>0){
   $totalpage=$totalrow%$pagesize==0?(int)($totalrow/$pagesize):(int)($totalrow/$pagesize)+1;
    if($curpage>$totalpage){
      $curpage=1;
   }
      
   $psql=$psql." limit ".(($curpage-1)*$pagesize).",".$pagesize;
    if($printsql) echo "<hr/>".$psql."<hr/>"; 
    $pagerset=getResultSetData($psql);//取得当前页记录
 }
 if($totalrow==0||$totalrow=="0"){ $curpage=1;}
 
}
?>

php代码获取客户端的MAC地址，供大家学习参考。
 

<?
//取浏览器客户端的MAC地址
//by http://www.
 class GetMacAddr 
 { 
   var $return_array = array(); // 返回带有MAC地址的字符串数组 
   var $mac_addr=array(); 
    
   function GetMacAddr() 
   { 
     switch (strtolower()(PHP_OS) ) 
     { 
       case "linux":$this->forLinux();break; 
       case "solaris":break; 
       case "unix":break; 
       case "aix":break; 
       default:$this->forWindows();break; 
     }   
      
     $temp_array = array(); 
     foreach ( $this->return_array as $value ) 
     { 
       if ( preg_match( "/[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]".
"[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f][:-]"."[0-9a-f][0-9a-f]/i", $value, $temp_array ) ) 
       { 
         $this->mac_addr[] = $temp_array[0]; 
       } 
     } 
     unset($temp_array); 
     return $this->mac_addr; 
   } 
  
   function forWindows() 
   { 
     @exec("ipconfig /all", $this->return_array); 
     if ( $this->return_array ) 
       return $this->return_array; 
     else{ 
       $ipconfig = $_SERVER["WINDIR"]."\system32\ipconfig.exe"; 
       if ( is_file($ipconfig) ) 
          @exec($ipconfig." /all", $this->return_array); 
       else 
          @exec($_SERVER["WINDIR"]."\system\ipconfig.exe /all", $this->return_array); 
       return $this->return_array; 
     } 
   } 
  
   function forLinux() 
   { 
     @exec("ifconfig -a", $this->return_array); 
     return $this->return_array; 
   } 
 } 
 
 //调用示例
 $mac = new GetMacAddr(); 
 echo "<pre>"; 
 print_r( $mac->mac_addr); 
 ?>

 
2、获取客户端MAC(在同一个网关内有效)

<?php
 function GetClientMac() { 
 $return_array = array(); 
 $temp_array = array(); 
 $mac_addr = ""; 
 @exec("arp -a",$return_array); 
 foreach($return_array as $value) { 
 if(strPos($value,$_SERVER["REMOTE_ADDR"]) !== false && preg_match("/(:?[0-9a-f]{2}[:-]){5}[0-9a-f]{2}/i",$value,$temp_array)) { 
 $mac_addr = $temp_array[0]; 
 break; 
 } 
 } 
 return ($mac_addr); 
 }
?>

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