超级好用的一个php上传图片类(随机名，缩略图，加水印)

Upimages.class.php php上传类

<?php 
class UpImages { 
var $annexFolder = "upload";//附件存放点，默认为：annex 
var $smallFolder = "small";//缩略图存放路径，注：必须是放在 $annexFolder下的子目录，默认为：smallimg 
var $markFolder = "mark";//水印图片存放处 
var $upFileType = "jpg gif png";//上传的类型，默认为：jpg gif png rar zip 
var $upFileMax = 1024;//上传大小限制，单位是“KB”，默认为：1024KB 
var $fontType;//字体 
var $maxWidth = 500; //图片最大宽度 
var $maxHeight = 600; //图片最大高度 
function UpImages($annexFolder,$smallFolder,$includeFolder) { 
$this->annexFolder = $annexFolder; 
$this->smallFolder = $smallFolder; 
$this->fontType = $includeFolder."/04B_08__.TTF"; 
} 
function upLoad($inputName) { 
$imageName = time();//设定当前时间为图片名称 
if(@empty($_FILES[$inputName]["name"])) die("没有上传图片信息，请确认"); 
$name = explode(".",$_FILES[$inputName]["name"]);//将上传前的文件以“.”分开取得文件类型 
$imgCount = count($name);//获得截取的数量 
$imgType = $name[$imgCount-1];//取得文件的类型 
if(strpos($this->upFileType,$imgType) === false) die(error("上传文件类型仅支持 ".$this->upFileType." 不支持 ".$imgType)); 
$photo = $imageName.".".$imgType;//写入数据库的文件名 
$uploadFile = $this->annexFolder."/".$photo;//上传后的文件名称 
$upFileok = move_uploaded_file($_FILES[$inputName]["tmp_name"],$uploadFile); 
if($upFileok) { 
$imgSize = $_FILES[$inputName]["size"]; 
$kSize = round($imgSize/1024); 
if($kSize > ($this->upFileMax*1024)) { 
@unlink($uploadFile); 
die(error("上传文件超过 ".$this->upFileMax."KB")); 
} 
} else { 
die(error("上传图片失败，请确认你的上传文件不超过 $upFileMax KB 或上传时间超时")); 
} 
return $photo; 
} 
function getInfo($photo) { 
$photo = $this->annexFolder."/".$photo; 
$imageInfo = getimagesize($photo); 
$imgInfo["width"] = $imageInfo[0]; 
$imgInfo["height"] = $imageInfo[1]; 
$imgInfo["type"] = $imageInfo[2]; 
$imgInfo["name"] = basename($photo); 
return $imgInfo; 
} 
function smallImg($photo,$width=128,$height=128) { 
$imgInfo = $this->getInfo($photo); 
$photo = $this->annexFolder."/".$photo;//获得图片源 
$newName = substr($imgInfo["name"],0,strrpos($imgInfo["name"], "."))."_thumb.jpg";//新图片名称 
if($imgInfo["type"] == 1) { 
$img = imagecreatefromgif($photo); 
} elseif($imgInfo["type"] == 2) { 
$img = imagecreatefromjpeg($photo); 
} elseif($imgInfo["type"] == 3) { 
$img = imagecreatefrompng($photo); 
} else { 
$img = ""; 
} 
if(empty($img)) return False; 
$width = ($width > $imgInfo["width"]) ? $imgInfo["width"] : $width; 
$height = ($height > $imgInfo["height"]) ? $imgInfo["height"] : $height; 
$srcW = $imgInfo["width"]; 
$srcH = $imgInfo["height"]; 
if ($srcW * $width > $srcH * $height) { 
$height = round($srcH * $width / $srcW); 
} else { 
$width = round($srcW * $height / $srcH); 
} 
if (function_exists("imagecreatetruecolor")) { 
$newImg = imagecreatetruecolor($width, $height); 
ImageCopyResampled($newImg, $img, 0, 0, 0, 0, $width, $height, $imgInfo["width"], $imgInfo["height"]); 
} else { 
$newImg = imagecreate($width, $height); 
ImageCopyResized($newImg, $img, 0, 0, 0, 0, $width, $height, $imgInfo["width"], $imgInfo["height"]); 
} 
if ($this->toFile) { 
if (file_exists($this->annexFolder."/".$this->smallFolder."/".$newName)) @unlink($this->annexFolder."/".$this->smallFolder."/".$newName); 
ImageJPEG($newImg,$this->annexFolder."/".$this->smallFolder."/".$newName); 
return $this->annexFolder."/".$this->smallFolder."/".$newName; 
} else { 
ImageJPEG($newImg); 
} 
ImageDestroy($newImg); 
ImageDestroy($img); 
return $newName; 
} 
function waterMark($photo,$text) { 
$imgInfo = $this->getInfo($photo); 
$photo = $this->annexFolder."/".$photo; 
$newName = substr($imgInfo["name"], 0, strrpos($imgInfo["name"], ".")) . "_mark.jpg"; 
switch ($imgInfo["type"]) { 
case 1: 
$img = imagecreatefromgif($photo); 
break; 
case 2: 
$img = imagecreatefromjpeg($photo); 
break; 
case 3: 
$img = imagecreatefrompng($photo); 
break; 
default: 
return False; 
} 
if (empty($img)) return False; 
$width = ($this->maxWidth > $imgInfo["width"]) ? $imgInfo["width"] : $this->maxWidth; 
$height = ($this->maxHeight > $imgInfo["height"]) ? $imgInfo["height"] : $this->maxHeight; 
$srcW = $imgInfo["width"]; 
$srcH = $imgInfo["height"]; 
if ($srcW * $width > $srcH * $height) { 
$height = round($srcH * $width / $srcW); 
} else { 
$width = round($srcW * $height / $srcH); 
} 
if (function_exists("imagecreatetruecolor")) { 
$newImg = imagecreatetruecolor($width, $height); 
ImageCopyResampled($newImg, $img, 0, 0, 0, 0, $width, $height, $imgInfo["width"], $imgInfo["height"]); 
} else { 
$newImg = imagecreate($width, $height); 
ImageCopyResized($newImg, $img, 0, 0, 0, 0, $width, $height, $imgInfo["width"], $imgInfo["height"]); 
} $white = imageColorAllocate($newImg, 255, 255, 255); 
$black = imageColorAllocate($newImg, 0, 0, 0); 
$alpha = imageColorAllocateAlpha($newImg, 230, 230, 230, 40); 
ImageFilledRectangle($newImg, 0, $height-26, $width, $height, $alpha); 
ImageFilledRectangle($newImg, 13, $height-20, 15, $height-7, $black); 
ImageTTFText($newImg, 4.9, 0, 20, $height-14, $black, $this->fontType, $text[0]); 
ImageTTFText($newImg, 4.9, 0, 20, $height-6, $black, $this->fontType, $text[1]); 
if($this->toFile) { 
if (file_exists($this->annexFolder."/".$this->markFolder."/".$newName)) @unlink($this->annexFolder."/".$this->markFolder."/".$newName); 
ImageJPEG($newImg,$this->annexFolder."/".$this->markFolder."/".$newName); 
return $this->annexFolder."/".$this->markFolder."/".$newName; 
} else { 
ImageJPEG($newImg); 
} 
ImageDestroy($newImg); 
ImageDestroy($img); 
return $newName; 
} 
} 
?>

使用方法

include 'Upimages.class.php'; 
$max="upload"; //文件上传路径 
$mix="small"; //缩略图路径（必须在upload下建立） 
$mark="mark"; //加水引的图片存放路径 
$text = array("oktang","2012"); //水印内容 
$img= new UpImages($max,$mix,$max); //实例化类文件 
$photo = $img->upLoad("file"); //上传的文件域 
$img->maxWidth = $img->maxHeight = 600; //设置高，和宽 
$img->toFile = true; 
$newSmallImg = $img->smallImg($photo); 
$newMark = $img->waterMark($photo,$text); 
echo $newSmallImg; 
echo $newMark; 
echo "<img src='".$newSmallImg."' border='0'><br><br>"; 
echo "<img src='".$newMark."' border='0'><br><br>";

注意里面有个字体文件，大家可以从网上下载。