一个支持水印的PHP图片上传类，应用在网站上面挺不错，参数比较多，功能很全，自定义月份建立子目录，自定义时间建立文件名，自定义上传的类型，自定义上传文件的大小，以及图片文印各项的值，可以说基本上我们用到的上传功能都已经具备了。

和其它php类一样，单独作为一个php的图片上传类，设置自定义的参数，也可以以全局设置自定义的参数，将不用的直接停止掉即可。

[code lang="php"]
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']))$this->error
fun('上传失败！');
if(!in_array($this->ptname['type'],$this->ultype))$this->erro
rfun('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');$this->ulpat
h=$this->ulpath.'month_'.date('Ym').'/';}
else{$this->ulpath=$this->ulpath;}
$this->createfun($this->ulpath);
if($this->ufname){$t=pathinfo($this->ptname['name']);$this->ulna
me=$this->ulpath.time().'.'.$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,$this->wm
strfont,$this->wmstr);$ww=$tp[2]-$tp[6];$wh=$tp[3]-$tp[7];unset($t
p);break;
case 1:$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));br
eak;//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($th
is->wmstrcolor,5));}
else{$this->errorfun('水印文字颜色不存在！');}
imagestring($g,$this->wmstrfont,$x,$y,$this->wmstr,imagecolo
rallocate($g,$R,$G,$B));break;
case 1;imagecopymerge($g,$w,$x,$y,0,0,$ww,$wh,$this->wmpictran
s);break;
default:imagecopymerge($g,$w,$x,$y,0,0,$ww,$wh,$this->wmpictra
ns);break;
}
@unlink($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='';
echo $msg;
exit;
}
}
?>
[/code]