一個非常好的PHP圖片上傳類，支持生成縮略圖，支持添加水印。

開始第一步：
創建文件夾，布局：
annex：附件（該目錄下存放上傳的原圖片）
|— smallimg：存放縮略圖片
|— mark：存放水印圖片
include：存放類文件，字體（本html' target='_blank'>程序代碼使用的是：arial.ttf）
|— upfile.php：集成簡單上傳，生成縮略圖及水印的類文件信息
|— arial.ttf：字體文件
upload.php：測試文件

第二步:PHP上傳類
upfile.php

<?phpclass UPImages {        var $annexFolder = "annex";//附件存放點，默認為：annex        var $smallFolder = "smallimg";//縮略圖存放路徑，注：必須是放在 $annexFolder下的子目錄，默認為：smallimg        var $markFolder = "mark";//水印圖片存放處        var $upFileType = "jpg gif png";//上傳的類型，默認為：jpg gif png rar zip        var $upFileMax = 1024;//上傳大小限制，單位是“KB”，默認為：1024KB        var $fontType;//字體        var $maxWidth = 500; //圖片最大寬度        var $maxHeight = 600; //圖片最大高度        function UPImages($annexFolder,$smallFolder,$includeFolder) {                $this->annexFolder = $annexFolder;                $this->smallFolder = $smallFolder;                $this->fontType = $includeFolder."/arial.ttf";        }        function upLoad($inputName) {                $imageName = time();//設定當前時間為圖片名稱                if(@empty($_FILES[$inputName]["name"])) die(error("沒有上傳圖片信息，請確認"));                $name = explode(".",$_FILES[$inputName]["name"]);//將上傳前的文件以“.”分開取得文件類型                $imgCount = count($name);//獲得截取的數量                $imgType = $name[$imgCount-1];//取得文件的類型                if(strpos($this->upFileType,$imgType) === false) die(error("上傳文件類型僅支持 ".$this->upFileType." 不支持 ".$imgType));                $photo = $imageName.".".$imgType;//寫入數據庫的文件名                $uploadFile = $this->annexFolder."/".$photo;//上傳后的文件名稱                $upFileok = move_uploaded_file($_FILES[$inputName]["tmp_name"],$uploadFile);                if($upFileok) {                        $imgSize = $_FILES[$inputName]["size"];                        $kSize = round($imgSize/1024);                        if($kSize > ($this->upFileMax*1024)) {                                @unlink($uploadFile);                                die(error("上傳文件超過 ".$this->upFileMax."KB"));                        }                } else {                        die(error("上傳圖片失敗，請確認你的上傳文件不超過 $upFileMax KB 或上傳時間超時"));                }                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;//獲得圖片源                $newName = substr($imgInfo["name"],0,strrpos($imgInfo["name"], "."))."_thumb.jpg";//新圖片名稱                if($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;        }}?>

第三步：測試上傳類
upload.php

<?php$annexFolder = "annex";$smallFolder = "smallimg";$markFolder = "mark";$includeFolder = "include";require("./".$includeFolder."/upfile.php");$img = new UPImages($annexFolder,$smallFolder,$includeFolder);$text = array("www.it165.net","all rights reserved");if(@$_GET["go"]) {        $photo = $img->upLoad("upfile");        $img->maxWidth = $img->maxHeight = 350;//設置生成水印圖像值        $img->toFile = true;        $newSmallImg = $img->smallImg($photo);        $newMark = $img->waterMark($photo,$text);        echo "<img src='http://shuimu.js.cn/wp-content/uploads/auto_save_image/2012/08/040324RBH.jpg".$newSmallImg."' border='0'><br><br>";        echo "<img src='http://shuimu.js.cn/wp-content/uploads/auto_save_image/2012/08/040324RBH.jpg".$newMark."' border='0'><br><br>";        echo "<a href='http://shuimu.js.cn/wp-content/uploads/auto_save_image/2012/08/040324RBH.jpgupload.php'>繼續上傳</a>";} else {?><form method="post" action="./upload.php?go=go" enctype="multipart/form-data"><input type="file" name="upfile"><br><br><input type="submit" value="上傳"></form><?php}?>

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