<?php
/****************************
上传类 By:donnier
****************************/
class upload_class{
private $ptname; //上传表单名称;
private $udname; //是否以月份建立子目录(0为否,其他为真);
private $ufname; //是否以时间建立文件名(0为否,其他为真);
private $ultype; //上传文件类型;
private $ulsize; //上传文件大小;
private $ulname; //输出文件名称;
private $ulpath; //输出文件路径;
private $wm;     //水印附加(0为不加,其他为加);
private $wmtype; //水印类型(0为文字,其他为图片);
private $wmpic;     //水印图片;
private $wmpicquality; //图片质量;
private $wmpictrans; //图片透明;
private $wmstr;     //水印字符;
private $wmstrsize; //字符大小;
private $wmstrfont; //字符字体;
private $wmstrcolor; //字符颜色;
private $wmpos;     //水印位置(1为顶端居左,2为顶端居中,3为顶端居右……);
function __construct($ptname='upfile',$udname=1,$ufname=1,$ultype=array('image/jpg','image/jpeg','image/png','image/pjpeg','image/gif','image/bmp','image/x-png'),$wm=1,$wmtype=1,$wmpic='images/wm.gif',$ulsize=2097152,$ulpath='images/temp/',$wmpictrans=20,$wmpicquality=80,$wmstr='DONLINE',$wmstrsize=5,$wmstrfont='./font/cour.ttf',$wmstrcolor='#ff0000',$wmpos=9){
   $this->ptname=$_FILES[$ptname];
   $this->udname=$udname;
   $this->ufname=$ufname;
   $this->ultype=$ultype;
   $this->ulsize=$ulsize;
   $this->ulpath=$ulpath;
   $this->wm=$wm;
   $this->wmtype=$wmtype;
   $this->wmpic=$wmpic;
   $this->wmpicquality=$wmpicquality;
   $this->wmpictrans=$wmpictrans;
   $this->wmstr=$wmstr;
   $this->wmstrsize=$wmstrsize;
   $this->wmstrfont=$wmstrfont;
   $this->wmstrcolor=$wmstrcolor;
   $this->wmpos=$wmpos;
}
function uploadfun(){
   if($_SERVER['REQUEST_METHOD']=='POST'){
if(!is_uploaded_file($this->ptname['tmp_name']))$this->errorfun('上传失败！');
if(!in_array($this->ptname['type'],$this->ultype))$this->errorfun('不支持的文件类型！');
if($this->ulsize<$this->ptname['size'])$this->errorfun('文件太大！');
if($this->udname){date_default_timezone_set('UTC');$this->ulpath=$this->ulpath.'month_'.date('Ym').'/';}
else{$this->ulpath=$this->ulpath;}
$this->createfun($this->ulpath);
if($this->ufname){$t=pathinfo($this->ptname['name']);$this->ulname=$this->ulpath.time().'.'.$t['extension'];}
else{$this->ulname=$this->ulpath.$this->ptname['name'];}
if(file_exists($this->ulname))$this->errorfun('该文件已存在！');
if(!move_uploaded_file($this->ptname['tmp_name'],$this->ulname))$this->errorfun('移动文件错误！');
$this->wmfun();
$this->errorfun('上传成功！');
   }
}
function createfun($d){
   if(!file_exists($d)){$this->createfun(dirname($d));mkdir($d);}
}
function wmfun(){
   if($this->wm){
if(file_exists($this->ulname)){
$groundimg=getimagesize($this->ulname);
$ow=$groundimg[0];
$oh=$groundimg[1];
switch($groundimg[2]){
    case 1:$g=imagecreatefromgif($this->ulname);break;
    case 2:$g=imagecreatefromjpeg($this->ulname);break;
    case 3:$g=imagecreatefrompng($this->ulname);break;
    case 4:$g=imagecreatefromwbmp($this->ulname);break;
    default:$this->errorfun('不支持的背景图片类型！');
}
}
else{$this->errorfun('背景图片不存在！');}
if(file_exists($this->wmpic)){
$wmimg=getimagesize($this->wmpic);
$ww=$wmimg[0];
$wh=$wmimg[1];
switch($wmimg[2]){
    case 1:$w=imagecreatefromgif($this->wmpic);break;
    case 2:$w=imagecreatefromjpeg($this->wmpic);break;
    case 3:$w=imagecreatefrompng($this->wmpic);break;
    case 4:$w=imagecreatefromwbmp($this->wmpic);break;
    default:$this->errorfun('不支持的水印图片类型！');
}
}
else{$this->errorfun('水印图片不存在！');}
switch($this->wmtype){
case 0:$tp=imagettfbbox(ceil($this->wmstrsize*2.5),0,$this->wmstrfont,$this->wmstr);$ww=$tp[2]-$tp[6];$wh=$tp[3]-$tp[7];unset($tp);break;
case 1:$ww=$ww;$wh=$wh;break;
default:$ww=$ww;$wh=$wh;break;
}
if($ow<$ww || $oh<$wh)$this->errorfun('背景图片太小！无法生成水印！');
switch($this->wmpos){  
case 0:$x=rand(0,($ow-$ww));$y=rand(0,($oh-$wh));break;//随机
      case 1:$x=0;$y=0;break;//1为顶端居左    
      case 2:$x=($ow-$ww)/2;$y=0;break;//2为顶端居中    
      case 3:$x=$ow-$ww;$y=0;break;//3为顶端居右    
      case 4:$x=0;$y=($oh-$wh)/2;break;//4为中部居左    
      case 5:$x=($ow-$ww)/2;$y=($oh-$wh)/2;break;//5为中部居中
      case 6:$x=$ow-$ww;$y=($oh-$wh)/2;break;//6为中部居右    
      case 7:$x=0;$y=$oh-$wh;break;//7为底端居左  
      case 8:$x=($ow-$ww)/2;$y=$oh-$wh;break;//8为底端居中    
      case 9:$x=$ow-$ww;$y=$oh-$wh;break;//9为底端居右    
      default:$x=rand(0,($ow-$ww));$y=rand(0,($oh-$wh));break;//随机      
   }
imagealphablending($g, true);
switch($this->wmtype){
case 0:
if($this->wmstrcolor){$R=hexdec(substr($this->wmstrcolor,1,2));$G=hexdec(substr($this->wmstrcolor,3,2));$B=hexdec(substr($this->wmstrcolor,5));}
else{$this->errorfun('水印文字颜色不存在！');}
imagestring($g,$this->wmstrfont,$x,$y,$this->wmstr,imagecolorallocate($g,$R,$G,$B));break;
case 1;imagecopymerge($g,$w,$x,$y,0,0,$ww,$wh,$this->wmpictrans);break;
default:imagecopymerge($g,$w,$x,$y,0,0,$ww,$wh,$this->wmpictrans);break;
}
@unlink($this->ulname);
switch($groundimg[2]){
      case 1:imagegif($g,$this->ulname);break;
      case 2:imagejpeg($g,$this->ulname,$this->wmpicquality);break;
      case 3:imagepng($g,$this->ulname);break;
case 4:imagewbmp($g,$this->ulname);break;
      default:$this->errorfun('生成图片失败！');
}
if(isset($wmimg))unset($wmimg);
   if(isset($w))imagedestroy($w);
   unset($groundimg);
   imagedestroy($g);
   }
}
function errorfun($e='未知错误！'){
   $msg='<script language="javascript" type="text/javascript">';
   $msg.='alert("'.$e.'");';
   $msg.='history.back();';
   $msg.='</script>';
   echo $msg;
   exit;
}
}
?>

<form enctype="multipart/form-data" method="post" action="upfile.php">
<input name="upfile" type="file" />
<input type="submit" name="Submit" value="提交" />

php文件
require_once('inc/upload_class.php');
$ul=new upload_class();
$ul->uploadfun();