PHP上传图片，生成略缩图，加水印工具类

php代码

<?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;
        }
}
?>