php SWFUpload 怎么创建缩略图并且保存到指定文件夹里面

1.upload.php

<?php
/*
 * swfupload图片上传  
 */
    if (isset($_POST["PHPSESSID"])) {
        session_id($_POST["PHPSESSID"]);
    }
    session_start();
    ini_set("html_errors", "0");
    if (!isset($_FILES["Filedata"]) || !is_uploaded_file($_FILES["Filedata"]["tmp_name"]) ||$_FILES["Filedata"]["error"] != 0) {
        echo "错误:无效的上传!";
        exit(0);
    }
 
    // Get the image and create a thumbnail
     $file_types=explode(".",$_FILES["Filedata"]["name"]);
     $file_type=$file_types[count($file_types)-1];
    if(strtolower($file_type)==&#39;gif&#39; )
    {
        $img = imagecreatefromgif($_FILES["Filedata"]["tmp_name"]);
    }
    else if(strtolower($file_type)==&#39;png&#39;)
    {
        $img = imagecreatefrompng($_FILES["Filedata"]["tmp_name"]);
    }
    else if(strtolower($file_type)==&#39;bmp&#39;)
    {
        $img = imagecreatefromwbmp($_FILES["Filedata"]["tmp_name"]);
    }
    else
    {
        $img = imagecreatefromjpeg($_FILES["Filedata"]["tmp_name"]);
    }
 
    if (!$img) {
        echo "错误:无法创建图像 ". $_FILES["Filedata"]["tmp_name"];
        exit(0);
    }
 
    $width = imageSX($img);
    $height = imageSY($img);
 
    if (!$width || !$height) {
        echo "错误：无效的高或高";
        exit(0);
    }
 
    // Build the thumbnail
    $target_width = 100;
    $target_height = 100;
    $target_ratio = $target_width / $target_height;
 
    $img_ratio = $width / $height;
 
    if ($target_ratio > $img_ratio) {
        $new_height = $target_height;
        $new_width = $img_ratio * $target_height;
    } else {
        $new_height = $target_width / $img_ratio;
        $new_width = $target_width;
    }
 
    if ($new_height > $target_height) {
        $new_height = $target_height;
    }
    if ($new_width > $target_width) {
        $new_height = $target_width;
    }
 
    $new_img = ImageCreateTrueColor(100, 100);
    if (!@imagefilledrectangle($new_img, 0, 0, $target_width-1, $target_height-1, 0)) { // Fill the image black
        echo "错误：不能填充新图片";
        exit(0);
    }
 
    if (!@imagecopyresampled($new_img, $img, ($target_width-$new_width)/2, ($target_height-$new_height)/2, 0,0, $new_width, $new_height, $width, $height)) {
        echo "错误：不能调整大小的图像";
        exit(0);
    }
 
    if (!isset($_SESSION["file_info"])) {
        $_SESSION["file_info"] = array();
    }
    ob_start();
    imagejpeg($new_img);
    $imagevariable = ob_get_contents();
    ob_end_clean();
 
    $file_id = md5($_FILES["Filedata"]["tmp_name"] + rand()*100000);
 
    $_SESSION["file_info"][$file_id] = $imagevariable;
    echo "FILEID:" . $file_id;  // Return the file id to the script
    include("upimg.class.php");
    if(!empty($_FILES["Filedata"]) and count(explode(",",$_SESSION["upload_tem"]))<5)
    {
        $folder="upload/images/tem/".date("Y-m-d");
        $up = new upimg("$folder","$folder"); //可以写成：$up = new upimg();
        $up->autoThumb = TRUE; //可省略
        $up->srcDel=TRUE;
        $up->thumbWidth = 550; //可省略
        $up->thumbHeight = 400; //可省略
        $up->maxsize=2014; //上传文件大小单位是kb
        $result= $up->upload(&#39;Filedata&#39;); // HTML中<input />的name属性值
        $_SESSION["upload_tem"]=$_SESSION["upload_tem"].",".$up->thumbPath;
        $_SESSION["upload_tem"]=trim($_SESSION["upload_tem"],",");
 
    }
 
?>

2.生成缩略图类upimg.class.php

<?php
class upimg{
    public $uploadFolder = &#39;upload&#39;; // 图片存放目录
    public $thumbFolder = &#39;upload/thumb&#39;; // 缩略图存放目录
    public $thumbWidth = &#39;&#39;; // 缩略图宽度
    public $thumbHeight = &#39;&#39;; // 缩略图高度
    public $autoThumb = &#39;&#39;; // 是否自动生成缩略图
    public $error = &#39;&#39;; // 错误信息
    public $imgPath = &#39;&#39;; // 上传成功后的图片位置
    public $thumbPath = &#39;&#39;; // 上传成功后的缩略图位置
    public $maxsize=&#39;&#39;;
 
    // 说明：初始化，创建存放目录
    function __construct($uploadFolder = &#39;upload&#39;, $thumbFolder = &#39;upload/thumb&#39;){
        $this->uploadFolder = $uploadFolder;
        $this->thumbFolder = $thumbFolder;
        $this->_mkdir();
    }
 
    // 说明：上传图片，参数是<input />的name属性值；成功返回图片的相对URL，失败返回FALSE和错误信息（在$this->error里）
    // bool/sting upload(string $html_tags_input_attrib_name);
    function upload($inputName){ // 上传操作，参数是input标签的name属性。
        if ($this->error){ // 如果有错，直接返回（例如_mkdir）
            return FALSE;
        }
        if(!$_FILES[$inputName]["name"]){
            $this->error = &#39;没有上传图片&#39;;
            return FALSE;
        }
        //检测文件大小
        if($_FILES[$inputName]["size"] > ($this->maxsize*1024)){
            $this->error = &#39;上传文件&#39;.$inputName.&#39;太大，最大支持&#39;.ceil($this->maxsize/1024).&#39;kb的文件&#39;;
            return FALSE;
        }
        if($_FILES[$inputName]["name"]){
            $isUpFile = $_FILES[$inputName][&#39;tmp_name&#39;];
            if (is_uploaded_file($isUpFile)){
                $imgInfo = $this->_getinfo($isUpFile);
                if (FALSE == $imgInfo){
                    return FALSE;
                }
                $extName = $imgInfo[&#39;type&#39;];
                $microSenond = floor(microtime()*10000);// 取一个毫秒级数字,4位。
                $newFileName = $uploadFolder . &#39;/&#39; . date(&#39;YmdHis&#39;) . $microSenond . &#39;.&#39; . $extName ; // 所上传图片的新名字。
                $location = $this->uploadFolder . $newFileName;
                $result = move_uploaded_file($isUpFile, $location);
                if ($result)
                {
                    if (TRUE == $this->autoThumb)
                        { // 是否生成缩略图
                             $thumb = $this->thumb($location, $this->thumbWidth, $this->thumbHeight);
                            if (FALSE == $thumb)
                            {
                                return FALSE;
                            }                       
                        }
                    //是否删除原图
                    if(TRUE==$this->srcDel)
                    {
                        @unlink ($location);
                    }
                    $this->imgPath = $location;
                    return $location;
                }else{
                    $this->error = &#39;移动临时文件时出错&#39;;
                    return FALSE;
                }
            }else{
                $uploadError = $_FILES[$inputName][&#39;error&#39;];
                if (1 == $uploadError){ // 文件大小超过了php.ini中的upload_max_filesize
                    $this->error = &#39;文件太大，服务器拒绝接收大于&#39; . ini_get(&#39;upload_max_filesize&#39;) . &#39;的文件&#39;;
                    return FALSE;
                }elseif (3 == $uploadError){ // 上传了部分文件
                    $this->error = &#39;上传中断，请重试&#39;;
                    return FALSE;
                }elseif (4 == $uploadError){
                    $this->error = &#39;没有文件被上传&#39;;
                    return FALSE;
                }elseif (6 == $uploadError){
                    $this->error = &#39;找不到临时文件夹，请联系您的服务器管理员&#39;;
                    return FALSE;
                }elseif (7 == $uploadError){
                    $this->error = &#39;文件写入失败，请联系您的服务器管理员&#39;;
                    return FALSE;
                }else{
                    if (0 != $uploadError){
                        $this->error = &#39;未知上传错误，请联系您的服务器管理员&#39;;
                        return FALSE;
                    }
                } // end if $uploadError
            } // end if is_uploaded_file else
        } // end if $_FILES[$inputName]["name"]
    }
 
    // 说明：获取图片信息，参数是上传后的临时文件，成功返回数组，失败返回FALSE和错误信息
    // array/bool _getinfo(string $upload_tmp_file)
    private function _getinfo($img){
        if (!file_exists($img)){
            $this->error = &#39;找不到图片，无法获取其信息&#39;;
            return FALSE;
        }
        $tempFile = @fopen($img, "rb");
        $bin = @fread($tempFile, 2); //只读2字节
        @fclose($tempFile);
        $strInfo = @unpack("C2chars", $bin);
        $typeCode = intval($strInfo[&#39;chars1&#39;] . $strInfo[&#39;chars2&#39;]);
        $fileType = &#39;&#39;;
        switch ($typeCode){ // 6677:bmp 255216:jpg 7173:gif 13780:png 7790:exe 8297:rar 8075:zip tar:109121 7z:55122 gz 31139
            case &#39;255216&#39;:
                $fileType = &#39;jpg&#39;;
                break;
            case &#39;6677&#39;:
                $fileType = &#39;bmp&#39;;
                break;
            case &#39;7173&#39;:
                $fileType = &#39;gif&#39;;
                break;
            case &#39;13780&#39;:
                $fileType = &#39;png&#39;;
                break;
            default:
                $fileType = &#39;unknown&#39;;
        }
        if ($fileType == &#39;jpg&#39; || $fileType == &#39;gif&#39; || $fileType == &#39;png&#39; || $fileType == &#39;bmp&#39;){
            $imageInfo = getimagesize($img);
            $imgInfo[&#39;size&#39;] = $imageInfo[&#39;bits&#39;];
            $imgInfo["type"] = $fileType;
            $imgInfo["width"] = $imageInfo[0];
            $imgInfo["height"] = $imageInfo[1];
            return $imgInfo;
        }else{ // 非图片类文件信息
            $this->error = &#39;图片类型错误&#39;;
            return FALSE;
        }
    } // end _getinfo
 
   // 说明：生成缩略图，等比例缩放或拉伸
    // bool/string thumb(string $uploaded_file, int $thumbWidth, int $thumbHeight, string $thumbTail);
    function thumb($img, $thumbWidth = 300, $thumbHeight = 200,$thumbTail = &#39;_thumb&#39;)
    {
        $filename = $img; // 保留一个名字供新的缩略图名字使用
        $imgInfo = $this->_getinfo($img,$i);
        if(FALSE == $imgInfo)
        {
            return FALSE;
        }
        $imgType = $imgInfo[&#39;type&#39;];
        switch ($imgType)
        { // 创建一个图，并给出扩展名
            case "jpg" :
                $img = imagecreatefromjpeg($img);
                $extName = &#39;jpg&#39;;
                break;
            case &#39;gif&#39; :
                $img = imagecreatefromgif($img);
                $extName = &#39;gif&#39;;
                break;
            case &#39;bmp&#39; :
                $img = imagecreatefromgif($img);
                $extName = &#39;bmp&#39;;
                break;
            case &#39;png&#39; :
                $img = imagecreatefrompng($img);
                $extName = &#39;png&#39;;
                break;
            default : // 如果类型错误，生成一张空白图
                $img = imagecreate($thumbWidth,$thumbHeight);
                imagecolorallocate($img,0x00,0x00,0x00);
                $extName = &#39;jpg&#39;;
        }
        // 缩放后的图片尺寸(小则拉伸，大就缩放)
        $imgWidth = $imgInfo[&#39;width&#39;];
        $imgHeight = $imgInfo[&#39;height&#39;];
        if($imgHeight > $imgWidth)
        { // 竖图
            $newHeight = $thumbHeight;
            $newWidth = ceil($imgWidth / ($imgHeight / $thumbHeight ));
        }
        else if($imgHeight < $imgWidth)
        { // 横图
            $newHeight = ceil($imgHeight / ($imgWidth / $thumbWidth ));
            $newWidth = $thumbWidth;
        }
        else if($imgHeight == $imgWidth)
        { // 等比例图
            $newHeight = $thumbWidth;
            $newWidth = $thumbWidth;
        }
        $bgimg = imagecreatetruecolor($newWidth,$newHeight);
        $bg = imagecolorallocate($bgimg,0x00,0x00,0x00);
        imagefill($bgimg,0,0,$bg);
        $sampled = imagecopyresampled($bgimg,$img,0,0,0,0,$newWidth,$newHeight,$imgWidth,$imgHeight);
        if(!$sampled )
        {
            $this->error = &#39;缩略图生成失败&#39;;
            $this->path=$this->uploadFolder . &#39;/&#39; . $filename;
            return FALSE;
        }
        $filename = basename($filename);
        $newFileName = substr($filename, 0, strrpos($filename, ".")) . $thumbTail . &#39;.&#39; . $extName ; // 新名字
        $thumbPath = $this->thumbFolder . &#39;/&#39; . $newFileName;
        switch ($extName){
            case &#39;jpg&#39;:
                $result = imagejpeg($bgimg, $thumbPath);
                break;
            case &#39;gif&#39;:
                $result = imagegif($bgimg, $thumbPath);
                break;
            case &#39;png&#39;:
                $result = imagepng($bgimg, $thumbPath);
                break;
            default: // 上边判断类型出错时会创建一张空白图，并给出扩展名为jpg
                $result = imagejpeg($bgimg, $thumbPath);
        }
        if ($result)
        {
            $this->thumbPath = $thumbPath;
            $this->path=$this->uploadFolder . &#39;/&#39; . $filename;
            return $thumbPath;
        }
        else
        {
            $this->error = &#39;缩略图创建失败&#39;;
            $this->path=$this->uploadFolder . &#39;/&#39; . $filename;
            return FALSE;
        }
    } // end thumb
 
   // 说明：创建图片的存放目录
    private function _mkdir()
    { // 创建图片上传目录和缩略图目录
        if(!is_dir($this->uploadFolder))
        {
            $dir = explode(&#39;/&#39;, $this->uploadFolder);
            foreach($dir as $v)
            {
                if($v)
                {
                    $d .= $v . &#39;/&#39;;
                    if(!is_dir($d))
                    {
                        $state = mkdir($d);
                        if(!$state)
                        {
                            $this->error = &#39;在创建目录&#39; . $d . &#39;时出错！&#39;;
                        }
                             
                    }
                }
            }
        }
        if(!is_dir($this->thumbFolder) && TRUE == $this->autoThumb)
        {   
            $dir = explode(&#39;/&#39;, $this->thumbFolder);
            foreach($dir as $v)
            {
                if($v)
                {
                    $d .= $v . &#39;/&#39;;
                    if(!is_dir($d))
                    {
                        $state = mkdir($d);
                        if(!$state)
                        {
                            $this->error = &#39;在创建目录&#39; . $d . &#39;时出错！&#39;;
                        }
                             
                    }
                }
            }
        }
    }
}
?>