php文件上传类可生成缩略图代码

php教程文件上传类可生成缩略图代码

if ($_GET['action'] == 'save') {       
      
    $up = new upload();       
    $up->set_dir(dirname(__FILE__).'/upload/','{y}/{m}');       
    $up->set_thumb(100,80);       
    $up->set_watermark(dirname(__FILE__).'/jblog/images/watermark.png',6,90);       
    $fs = $up->execute();       
      
    var_dump($fs);       
}    

   
?>       

       
           
           
   

       
               
               
               
   

       
           
 

 

class upload {       
      
    var $dir;            //附件存放物理目录       
    var $time;           //自定义文件上传时间       
    var $allow_types;    //允许上传附件类型       
    var $field;          //上传控件名称       
    var $maxsize;        //最大允许文件大小，单位为KB       
      
    var $thumb_width;    //缩略图宽度       
    var $thumb_height;   //缩略图高度       
      
    var $watermark_file; //水印图片地址       
    var $watermark_pos;  //水印位置       
    var $watermark_trans;//水印透明度       
      
      
    //构造函数       
    //$types : 允许上传的文件类型 , $maxsize : 允许大小 ,  $field : 上传控件名称 , $time : 自定义上传时间       
    function upload($types = 'jpg|png', $maxsize = 1024, $field = 'attach', $time = '') {       
        $this->allow_types = explode('|',$types);       
        $this->maxsize = $maxsize * 1024;       
        $this->field = $field;       
        $this->time = $time ? $time : time();       
    }       
      
    //设置并创建文件具体存放的目录       
    //$basedir  : 基目录，必须为物理路径       
    //$filedir  : 自定义子目录，可用参数{y}、{m}、{d}       
    function set_dir($basedir,$filedir = '') {       
        $dir = $basedir;       
        !is_dir($dir) && @mkdir($dir,0777);       
        if (!emptyempty($filedir)) {       
            $filedir = str_replace(array('{y}','{m}','{d}'),array(date('Y',$this->time),date('m',$this->time),date('d',$this->time)),strtolower($filedir));       
            $dirs = explode('/',$filedir);       
            foreach ($dirs as $d) {       
                !emptyempty($d) && $dir .= $d.'/';       
                !is_dir($dir) && @mkdir($dir,0777);       
            }       
        }       
        $this->dir = $dir;       
    }       
      
    //图片缩略图设置，如果不生成缩略图则不用设置       
    //$width : 缩略图宽度 , $height : 缩略图高度       
    function set_thumb ($width = 0, $height = 0) {       
        $this->thumb_width  = $width;       
        $this->thumb_height = $height;       
    }       
      
    //图片水印设置，如果不生成添加水印则不用设置       
    //$file : 水印图片 , $pos : 水印位置 , $trans : 水印透明度       
    function set_watermark ($file, $pos = 6, $trans = 80) {       
        $this->watermark_file  = $file;       
        $this->watermark_pos   = $pos;       
        $this->watermark_trans = $trans;       
    }       
      
    /*----------------------------------------------------------------     
    执行文件上传，处理完返回一个包含上传成功或失败的文件信息数组，     
    其中：name 为文件名，上传成功时是上传到服务器上的文件名，上传失败则是本地的文件名     
          dir  为服务器上存放该附件的物理路径，上传失败不存在该值     
          size 为附件大小，上传失败不存在该值     
          flag 为状态标识，1表示成功，-1表示文件类型不允许，-2表示文件大小超出     
    -----------------------------------------------------------------*/      
    function execute() {       
        $files = array(); //成功上传的文件信息       
        $field = $this->field;       
        $keys = array_keys($_FILES[$field]['name']);       
        foreach ($keys as $key) {       
            if (!$_FILES[$field]['name'][$key]) continue;       
                   
            $fileext = $this->fileext($_FILES[$field]['name'][$key]); //获取文件扩展名       
            $filename = date('Ymdhis',$this->time).mt_rand(10,99).'.'.$fileext; //生成文件名       
            $filedir = $this->dir;  //附件实际存放目录       
            $filesize = $_FILES[$field]['size'][$key]; //文件大小       
                   
            //文件类型不允许       
            if (!in_array($fileext,$this->allow_types)) {       
                $files[$key]['name'] = $_FILES[$field]['name'][$key];       
                $files[$key]['flag'] = -1;       
                continue;       
            }       
      
            //文件大小超出       
            if ($filesize > $this->maxsize) {       
                $files[$key]['name'] = $_FILES[$field]['name'][$key];       
                $files[$key]['name'] = $filesize;       
                $files[$key]['flag'] = -2;       
                continue;       
            }       
      
            $files[$key]['name'] = $filename;       
            $files[$key]['dir'] = $filedir;       
            $files[$key]['size'] = $filesize;       
      
            //保存上传文件并删除临时文件       
            if (is_uploaded_file($_FILES[$field]['tmp_name'][$key])) {       
                move_uploaded_file($_FILES[$field]['tmp_name'][$key],$filedir.$filename);       
                @unlink($_FILES[$field]['tmp_name'][$key]);       
                $files[$key]['flag'] = 1;       
      
                //对图片进行加水印和生成缩略图       
                if (in_array($fileext,array('jpg','png'))) {       
                    if ($this->thumb_width) {       
                        if ($this->create_thumb($filedir.$filename,$filedir.'thumb_'.$filename)) {       
                            $files[$key]['thumb'] = 'thumb_'.$filename;  //缩略图文件名       
                        }       
                    }       
                    $this->create_watermark($filedir.$filename);       
                }       
            }       
        }       
      
        return $files;       
    }       
      
    //创建缩略图,以相同的扩展名生成缩略图       
    //$src_file : 来源图像路径 , $thumb_file : 缩略图路径       
    function create_thumb ($src_file,$thumb_file) {       
        $t_width  = $this->thumb_width;       
        $t_height = $this->thumb_height;       
      
        if (!file_exists($src_file)) return false;       
      
        $src_info = getImageSize($src_file);       
      
        //如果来源图像小于或等于缩略图则拷贝源图像作为缩略图       
        if ($src_info[0]             if (!copy($src_file,$thumb_file)) {       
                return false;       
            }       
            return true;       
        }       
      
        //按比例计算缩略图大小       
        if ($src_info[0] - $t_width > $src_info[1] - $t_height) {       
            $t_height = ($t_width / $src_info[0]) * $src_info[1];       
        } else {       
            $t_width = ($t_height / $src_info[1]) * $src_info[0];       
        }       
      
        //取得文件扩展名       
        $fileext = $this->fileext($src_file);       
      
        switch ($fileext) {       
            case 'jpg' :       
                $src_img = ImageCreateFromJPEG($src_file); break;       
            case 'png' :       
                $src_img = ImageCreateFromPNG($src_file); break;       
            case 'gif' :       
                $src_img = ImageCreateFromGIF($src_file); break;       
        }       
      
        //创建一个真彩色的缩略图像       
        $thumb_img = @ImageCreateTrueColor($t_width,$t_height);       
      
        //ImageCopyResampled函数拷贝的图像平滑度较好，优先考虑       
        if (function_exists('imagecopyresampled')) {       
            @ImageCopyResampled($thumb_img,$src_img,0,0,0,0,$t_width,$t_height,$src_info[0],$src_info[1]);       
        } else {       
            @ImageCopyResized($thumb_img,$src_img,0,0,0,0,$t_width,$t_height,$src_info[0],$src_info[1]);       
        }       
      
        //生成缩略图       
        switch ($fileext) {       
            case 'jpg' :       
                ImageJPEG($thumb_img,$thumb_file); break;       
            case 'gif' :       
                ImageGIF($thumb_img,$thumb_file); break;       
            case 'png' :       
                ImagePNG($thumb_img,$thumb_file); break;       
        }       
      
        //销毁临时图像       
        @ImageDestroy($src_img);       
        @ImageDestroy($thumb_img);       
      
        return true;       
      
    }       
      
    //为图片添加水印       
    //$file : 要添加水印的文件       
    function create_watermark ($file) {       
      
        //文件不存在则返回       
        if (!file_exists($this->watermark_file) || !file_exists($file)) return;       
        if (!function_exists('getImageSize')) return;       
               
        //检查GD支持的文件类型       
        $gd_allow_types = array();       
        if (function_exists('ImageCreateFromGIF')) $gd_allow_types['image/gif'] = 'ImageCreateFromGIF';       
        if (function_exists('ImageCreateFromPNG')) $gd_allow_types['image/png'] = 'ImageCreateFromPNG';       
        if (function_exists('ImageCreateFromJPEG')) $gd_allow_types['image/jpeg'] = 'ImageCreateFromJPEG';       
      
        //获取文件信息       
        $fileinfo = getImageSize($file);       
        $wminfo   = getImageSize($this->watermark_file);       
      
        if ($fileinfo[0]       
        if (array_key_exists($fileinfo['mime'],$gd_allow_types)) {       
            if (array_key_exists($wminfo['mime'],$gd_allow_types)) {       
                       
                //从文件创建图像       
                $temp = $gd_allow_types[$fileinfo['mime']]($file);       
                $temp_wm = $gd_allow_types[$wminfo['mime']]($this->watermark_file);       
      
                //水印位置       
                switch ($this->watermark_pos) {                    
                    case 1 :  //顶部居左       
                        $dst_x = 0; $dst_y = 0; break;                     
                    case 2 :  //顶部居中       
                        $dst_x = ($fileinfo[0] - $wminfo[0]) / 2; $dst_y = 0; break;                       
                    case 3 :  //顶部居右       
                        $dst_x = $fileinfo[0]; $dst_y = 0; break;                      
                    case 4 :  //底部居左       
                        $dst_x = 0; $dst_y = $fileinfo[1]; break;                      
                    case 5 :  //底部居中       
                        $dst_x = ($fileinfo[0] - $wminfo[0]) / 2; $dst_y = $fileinfo[1]; break;            
                    case 6 :  //底部居右       
                        $dst_x = $fileinfo[0]-$wminfo[0]; $dst_y = $fileinfo[1]-$wminfo[1]; break;       
                    default : //随机       
                        $dst_x = mt_rand(0,$fileinfo[0]-$wminfo[0]); $dst_y = mt_rand(0,$fileinfo[1]-$wminfo[1]);       
                }       
      
                if (function_exists('ImageAlphaBlending')) ImageAlphaBlending($temp_wm,True); //设定图像的混色模式       
                if (function_exists('ImageSaveAlpha')) ImageSaveAlpha($temp_wm,True); //保存完整的 alpha 通道信息       
      
                //为图像添加水印       
                if (function_exists('imageCopyMerge')) {       
                    ImageCopyMerge($temp,$temp_wm,$dst_x,$dst_y,0,0,$wminfo[0],$wminfo[1],$this->watermark_trans);       
                } else {       
                    ImageCopyMerge($temp,$temp_wm,$dst_x,$dst_y,0,0,$wminfo[0],$wminfo[1]);       
                }       
      
                //保存图片       
                switch ($fileinfo['mime']) {       
                    case 'image/jpeg' :       
                        @imageJPEG($temp,$file);       
                        break;       
                    case 'image/png' :       
                        @imagePNG($temp,$file);       
                        break;       
                    case 'image/gif' :        
                        @imageGIF($temp,$file);       
                        break;       
                }       
                //销毁零时图像       
                @imageDestroy($temp);       
                @imageDestroy($temp_wm);       
            }       
        }       
    }       
      
    //获取文件扩展名       
    function fileext($filename) {       
        return strtolower(substr(strrchr($filename,'.'),1,10));       
    }       
}