PHP文件夹遍历，图片等比例压缩

        /**
    * 来源：互联网
    */
    class image
    {
        var $w_pct = 100; //透明度
        var $w_quality = 100; //质量
        var $w_minwidth = 500; //最小宽
        var $w_minheight = 500; //最小高
        var $interlace = 0;  //图像是否为隔行扫描的
        var $fontfile ;  //字体文件
        var $w_img ; //默认水印图

        function __construct()
        {
            $this->fontfile = $_SERVER['DOCUMENT_ROOT'].'/public/fonts/simhei.ttf';
            $this->w_img = '';
        }
        function image()
        {
            $this->__construct();
        }

        function info($img)
        {
            $imageinfo = getimagesize($img); //返回图像信息数组 0=>宽的像素 1=>高的像素 2=>是图像类型的标记 3 =>是文本字符串，内容为“height="yyy" width="xxx"”，
            if($imageinfo === false) return false;
            $imagetype = strtolower(substr(image_type_to_extension($imageinfo[2]),1)); //获取图像文件类型 $imageinfo[2]是图像类型的标记
            $imagesize = filesize($img); //图像大小
            $info = array(
            'width'=>$imageinfo[0],
            'height'=>$imageinfo[1],
            'type'=>$imagetype,
            'size'=>$imagesize,
            'mime'=>$imageinfo['mime']
            );
            return $info;
        }

        /**
         * 缩略图
         *
         * @param string $image
         * @param string $filename
         * @param int $maxwidth
         * @param int $maxheight
         * @param string $suffix
         * @param int $autocut
         * @return string
         */
        function thumb($image, $filename = '',$maxwidth = 50, $maxheight = 50, $suffix='_thumb', $autocut = 0)
        {
            if( !$this->check($image)) return false;
            $info  = $this->info($image); //获取图片信息
            if($info === false) return false;
            $srcwidth  = $info['width']; //源图宽
            $srcheight = $info['height']; //源图高
            $pathinfo = pathinfo($image);
            $type =  $pathinfo['extension']; //取得扩展名
            if(!$type) $type = $info['type']; //如果没有取到，用$info['type']
            $type = strtolower($type);
            unset($info);
            $scale = min($maxwidth/$srcwidth, $maxheight/$srcheight); //获取缩略比例
            //获取按照源图的比列
            $createwidth = $width  = (int) ($srcwidth*$scale);//取得缩略宽();
            $createheight = $height = (int)($srcheight*$scale);//(); //取得缩略高
            $psrc_x = $psrc_y = 0;
            if($autocut) //按照缩略图的比例来获取
            {
                if($maxwidth/$maxheight=$height) //如果缩略图按比列比源图窄的话
                {
                    $width = $maxheight/$height*$width; //宽按照相应比例做处理
                    $height = $maxheight;// //高不变
                }
                elseif($maxwidth/$maxheight>$srcwidth/$srcheight && $maxwidth>=$width)//如果缩略图按比列比源图宽的话
                {
                    $height = $maxwidth/$width*$height;//
                    $width = $maxwidth;
                }
                if($maxwidth == '55'){
                    $width = '55';
                    $createwidth = '55';
                }
                if($maxwidth == '110'){
                    $width = '110';
                    $createwidth = '110';
                }

            }
                if($srcwidth                    $createwidth= $srcwidth;
                    $createheight = $srcheight;
                }
            $createfun = 'imagecreatefrom'.($type=='jpg' ? 'jpeg' : $type); //找到不同的图像处理函数
            $srcimg = $createfun($image); //返回图像标识符
            if($type != 'gif' && function_exists('imagecreatetruecolor')){
                $thumbimg = imagecreatetruecolor($createwidth, $createheight); //新建一个真彩色图像
            }else{
                if($maxwidth == '110' && $srcheight >= $srcwidth){
                    $height1 = 72;
                    $thumbimg = imagecreate($width, $height1); //新建一个基于调色板的图像
                }elseif ($maxwidth == '110' && $srcheight                     $width1 = 110;
                    $thumbimg = imagecreate($width1, $height); //新建一个基于调色板的图像
                }else{
                    $thumbimg = imagecreate($width, $height); //新建一个基于调色板的图像
                }
            }
            if(function_exists('imagecopyresampled')){ //重采样拷贝部分图像并调整大小，真彩
                //imagecopyresampled(新图，源图,新图左上角x距离,新图左上角y距离,源图左上角x距离,源图左上角y距离,新图宽,新图高,源图宽,源图高)
                    if($maxwidth == '110' && $srcheight >= $srcwidth){
                        $psrc_x = 0;
                        $psrc_yz = $height/2;
                        $psrc_y = $psrc_yz;
                        $width = '110';
                    }
                    if($maxwidth == '110' && $srcheight >= $srcwidth && $srcheight>= '72' && $srcwidth                         $psrc_x = 0;
                        $psrc_yz = $height/2;
                        $psrc_y = $psrc_yz;
                        $width = '110';
                    }
                    if($maxheight == '72' && $srcheight = '110'){
                        $cha = ($maxheight-$srcheight)/2;
                        $psrc_y = -($cha);
                        $width = $srcwidth;
                        $height = '72';
                        $srcheight = '72';
                    }
                imagecopyresampled($thumbimg, $srcimg, 0, 0, $psrc_x, $psrc_y, $width, $height, $srcwidth, $srcheight);

            }else{ //拷贝部分图像并调整大小，调色板
                imagecopyresized($thumbimg, $srcimg, 0, 0, $psrc_x, $psrc_y, $width, $height,  $srcwidth, $srcheight);
            }
            if($type=='gif' || $type=='png')
            {
                //imagecolorallocate 为一幅图像分配颜色
                $background_color  =  imagecolorallocate($thumbimg,  0, 255, 0);  // 给基于调色板的图像填充背景色， 指派一个绿色
                // imagecolortransparent 将某个颜色定义为透明色
                imagecolortransparent($thumbimg, $background_color);  //  设置为透明色，若注释掉该行则输出绿色的图
            }
            // imageinterlace 激活或禁止隔行扫描
            if($type=='jpg' || $type=='jpeg') imageinterlace($thumbimg, $this->interlace);
            $imagefun = 'image'.($type=='jpg' ? 'jpeg' : $type);
            //imagejpeg imagegif imagepng
            if(empty($filename)) $filename  = substr($image, 0, strrpos($image, '.')).$suffix.'.'.$type; //获取文件名
            //aaa.gif aaa_thumb.gif
            $imagefun($thumbimg, $filename); //新建图像
            imagedestroy($thumbimg); //销毁缩略图
            imagedestroy($srcimg); //销毁源图
            return $filename;
        }
        /**
         * 限制宽或高
         *
         * @param string $image
         * @param int $maxwidth
         * @param int $maxheight
         * @param string $suffix
         * @return string
         */
        function thumb3($image,$maxwidth = 0, $maxheight = 0, $suffix='_thumb')
        {
            if( !$this->check($image)) return false;
            $info  = $this->info($image); //获取图片信息
            if($info === false) return false;
            $srcwidth  = $info['width']; //源图宽
            $srcheight = $info['height']; //源图高
            $pathinfo = pathinfo($image);
            $type =  $pathinfo['extension']; //取得扩展名
            if(!$type) $type = $info['type']; //如果没有取到，用$info['type']
            $type = strtolower($type);
            unset($info);
            if($maxwidth==0){
                $scale = $maxheight/$srcheight;
                if($scale                    $createwidth = $srcwidth*$scale;
                    $createheight = $maxheight;
                }else{
                    $createwidth = $srcwidth;
                    $createheight = $srcheight;
                }
            }
            if($maxheight==0){
                $scale = $maxwidth/$srcwidth;
                if($scale                    $createwidth = $maxwidth;
                    $createheight = $srcheight*$scale;
                }else{
                    $createwidth = $srcwidth;
                    $createheight = $srcheight;
                }
            }
            $psrc_x = $psrc_y = 0;
            $createfun = 'imagecreatefrom'.($type=='jpg' ? 'jpeg' : $type); //找到不同的图像处理函数
            $srcimg = $createfun($image); //返回图像标识符
            if($type != 'gif' && function_exists('imagecreatetruecolor')){
                $thumbimg = imagecreatetruecolor($createwidth, $createheight); //新建一个真彩色图像
            }else{
                $thumbimg = imagecreate($createwidth, $createheight); //新建一个基于调色板的图像
            }
            if(function_exists('imagecopyresampled')){ //重采样拷贝部分图像并调整大小，真彩
                //imagecopyresampled(新图，源图,新图左上角x距离,新图左上角y距离,源图左上角x距离,源图左上角y距离,新图宽,新图高,源图宽,源图高)
                imagecopyresampled($thumbimg, $srcimg, 0, 0, $psrc_x, $psrc_y, $createwidth, $createheight, $srcwidth, $srcheight);

            }else{ //拷贝部分图像并调整大小，调色板
                imagecopyresized($thumbimg, $srcimg, 0, 0, $psrc_x, $psrc_y, $createwidth, $createheight,  $srcwidth, $srcheight);
            }
            if($type=='gif' || $type=='png')
            {
                //imagecolorallocate 为一幅图像分配颜色
                $background_color  =  imagecolorallocate($thumbimg,  0, 255, 0);  // 给基于调色板的图像填充背景色， 指派一个绿色
                // imagecolortransparent 将某个颜色定义为透明色
                imagecolortransparent($thumbimg, $background_color);  //  设置为透明色，若注释掉该行则输出绿色的图
            }
            // imageinterlace 激活或禁止隔行扫描
            if($type=='jpg' || $type=='jpeg') imageinterlace($thumbimg, $this->interlace);
            $imagefun = 'image'.($type=='jpg' ? 'jpeg' : $type);
            //imagejpeg imagegif imagepng
            $filename  = substr($image, 0, strrpos($image, '.')).$suffix.'.'.$type; //获取文件名
            //aaa.gif aaa_thumb.gif
            $imagefun($thumbimg, $filename); //新建图像
            imagedestroy($thumbimg); //销毁缩略图
            imagedestroy($srcimg); //销毁源图
            return $filename;
        }
        /**
         * 生成特定尺寸缩略图 解决原版缩略图不能满足特定尺寸的问题 PS：会裁掉图片不符合缩略图比例的部分
         * @static
         * @access public
         * @param string $image  原图
         * @param string $type 图像格式
         * @param string $thumbname 缩略图文件名
         * @param string $maxWidth  宽度
         * @param string $maxHeight  高度
         * @param boolean $interlace 启用隔行扫描
         * @return void
         */
        static function thumb2($image, $thumbname, $type='', $maxWidth=200, $maxHeight=50, $interlace=true) {
            // 获取原图信息
            $info = Image::getImageInfo($image);
            if ($info !== false) {
                $srcWidth = $info['width'];
                $srcHeight = $info['height'];
                $type = empty($type) ? $info['type'] : $type;
                $type = strtolower($type);
                $interlace = $interlace ? 1 : 0;
                unset($info);
                $scale = max($maxWidth / $srcWidth, $maxHeight / $srcHeight); // 计算缩放比例
                //判断原图和缩略图比例 如原图宽于缩略图则裁掉两边 反之..
                if($maxWidth / $srcWidth > $maxHeight / $srcHeight){
                    //高于
                    $srcX = 0;
                    $srcY = ($srcHeight - $maxHeight / $scale) / 2 ;
                    $cutWidth = $srcWidth;
                    $cutHeight = $maxHeight / $scale;
                }else{
                    //宽于
                    $srcX = ($srcWidth - $maxWidth / $scale) / 2;
                    $srcY = 0;
                    $cutWidth = $maxWidth / $scale;
                    $cutHeight = $srcHeight;
                }

                // 载入原图
                $createFun = 'ImageCreateFrom' . ($type == 'jpg' ? 'jpeg' : $type);
                $srcImg = $createFun($image);

                //创建缩略图
                if ($type != 'gif' && function_exists('imagecreatetruecolor'))
                    $thumbImg = imagecreatetruecolor($maxWidth, $maxHeight);
                else
                    $thumbImg = imagecreate($maxWidth, $maxHeight);

                // 复制图片
                if (function_exists("ImageCopyResampled"))
                    imagecopyresampled($thumbImg, $srcImg, 0, 0, $srcX, $srcY, $maxWidth, $maxHeight, $cutWidth, $cutHeight);
                else
                    imagecopyresized($thumbImg, $srcImg, 0, 0, $srcX, $srcY, $maxWidth, $maxHeight, $cutWidth, $cutHeight);
                if ('gif' == $type || 'png' == $type) {
                    //imagealphablending($thumbImg, false);//取消默认的混色模式
                    //imagesavealpha($thumbImg,true);//设定保存完整的 alpha 通道信息
                    $background_color = imagecolorallocate($thumbImg, 0, 255, 0);  //  指派一个绿色
                    imagecolortransparent($thumbImg, $background_color);  //  设置为透明色，若注释掉该行则输出绿色的图
                }

                // 对jpeg图形设置隔行扫描
                if ('jpg' == $type || 'jpeg' == $type)
                    imageinterlace($thumbImg, $interlace);

                // 生成图片
                $imageFun = 'image' . ($type == 'jpg' ? 'jpeg' : $type);
                @chmod(dirname($thumbname),0777);
                $imageFun($thumbImg, $thumbname);
                imagedestroy($thumbImg);
                imagedestroy($srcImg);
                return $thumbname;
            }
            return false;
        }


        /**
         * 取得图像信息
         * @static
         * @access public
         * @param string $image 图像文件名
         * @return mixed
         */

        static function getImageInfo($img) {
            $imageInfo = getimagesize($img);
            if ($imageInfo !== false) {
                $imageType = strtolower(substr(image_type_to_extension($imageInfo[2]), 1));
                $imageSize = filesize($img);
                $info = array(
                        "width" => $imageInfo[0],
                        "height" => $imageInfo[1],
                        "type" => $imageType,
                        "size" => $imageSize,
                        "mime" => $imageInfo['mime']
                );
                return $info;
            } else {
                return false;
            }
        }

        //watermark(源图,生成文件,生成位置,水印文件,水印文本,背景色)
        function watermark($source, $target = '', $w_pos = 9, $w_img = '', $w_text = '', $w_font = 12, $w_color = '#cccccc',$x='',$y='')
        {
            if( !$this->check($source)) return false;
            if(!$target) $target = $source;
            if ($w_img == '' && $w_text == '')
            $w_img = $this->w_img;
            $source_info = getimagesize($source);
            $source_w    = $source_info[0]; //获取宽
            $source_h    = $source_info[1]; //获取高
            if($source_w w_minwidth || $source_h w_minheight) return false; //宽和高达不到要求直接返回
            switch($source_info[2]) //新建图片
            {
                case 1 :
                    $source_img = imagecreatefromgif($source);
                    break;
                case 2 :
                    $source_img = imagecreatefromjpeg($source);
                    break;
                case 3 :
                    $source_img = imagecreatefrompng($source);
                    break;
                default :
                    return false;
            }
            if(!empty($w_img) && file_exists($w_img)) //水印文件
            {
                $ifwaterimage = 1; //是否水印图
                $water_info   = getimagesize($w_img); //水印信息
                $width        = $water_info[0];
                $height       = $water_info[1];

                switch($water_info[2])
                {
                    case 1 :
                        $water_img = imagecreatefromgif($w_img);

                        break;
                    case 2 :
                        $water_img = imagecreatefromjpeg($w_img);
                        break;
                    case 3 :
                        $water_img = imagecreatefrompng($w_img);

                        break;
                    default :
                        return;
                }
            }
            else
            {
                $ifwaterimage = 0;
                //imagettfbbox 本函数计算并返回一个包围着 TrueType 文本范围的虚拟方框的像素大小。
                //imagettfbbox ( 字体大小, 字体角度, 字体文件,文件 )
    //             echo $this->fontfile;
                $temp = imagettfbbox(ceil($w_font*1.6), 0, $this->fontfile, $w_text);//取得使用 truetype 字体的文本的范围
                $width = $temp[4] - $temp[6]; //右上角 X 位置 - 左上角 X 位置
                $height = $temp[3] - $temp[5]; //右下角 Y 位置- 右上角 Y 位置
                unset($temp);
            }
            switch($w_pos)
            {
                case 0: //随机位置
                $wx = rand(0,($source_w - $width));
                $wy = rand(0,($source_h - $height));
                break;
                case 1: //左上角
                $wx = 25;
                $wy = 25;
                break;
                case 2: //上面中间位置
                $wx = ($source_w - $width) / 2;
                $wy = 0;
                break;
                case 3: //右上角
                $wx = $source_w - $width;
                $wy = 0;
                break;
                case 4: //左面中间位置
                $wx = 0;
                $wy = ($source_h - $height) / 2;
                break;
                case 5: //中间位置
                $wx = ($source_w - $width) / 2;
                $wy = ($source_h - $height) / 2;
                break;
                case 6: //底部中间位置
                $wx = ($source_w - $width) / 2;
                $wy = $source_h - $height;
                break;
                case 7: //左下角
                $wx = 0;
                $wy = $source_h - $height;
                break;
                case 8: //右面中间位置
                $wx = $source_w - $width;
                $wy = ($source_h - $height) /2;
                break;
                case 9: //右下角
                $wx = $source_w - $width;
                $wy = $source_h - $height ;
                break;
                default: //随机
                $wx = rand(0,($source_w - $width));
                $wy = rand(0,($source_h - $height));
                break;
                case 10://自定义位置
                $wx = $x;
                $wy = $y;
                            case 11: //底部中间位置--手工客专用
                $wx = ($source_w - $width) / 2;
                $wy = $source_h - $height-50;
                break;
                break;
            }
            if($ifwaterimage) //如果有水印图
            {

                //imagecopymerge 拷贝并合并图像的一部分
                //参数(源图,水印图,拷贝到源图x位置,拷贝到源图y位置,从水印图x位置,从水印图y位置,高,宽,透明度)
                //imagecopymerge($source_img, $water_img, $wx, $wy, 0, 0, $width, $height, $this->w_pct);

                imagecopy($source_img,$water_img,$wx,$wy,0,0,$width,$height);
            }
            else
            {
                if(!empty($w_color) && (strlen($w_color)==7))
                {
                    $r = hexdec(substr($w_color,1,2)); //获取红色
                    $g = hexdec(substr($w_color,3,2)); //获取绿色
                    $b = hexdec(substr($w_color,5)); //获取蓝色
                }
                else
                {
                    return;
                }
                //imagecolorallocate 基于调色板的图像填充背景色
                //imagestring 水平地画一行字符串
                //imagestring(源图,字体大小,位置X,位置Y,文字,颜色)
                //参数($image, float $size, float $angle, int $x, int $y, int $color, string $fontfile, string $text)
                imagettftext($source_img,$w_font,0,$wx,$wy,imagecolorallocate($source_img,$r,$g,$b),$this->fontfile,$w_text);
                //imagestring($source_img,$w_font,$wx,$wy,$w_text,imagecolorallocate($source_img,$r,$g,$b));
            }

            //输出到文件或者浏览器
            switch($source_info[2])
            {
                case 1 :
                    imagegif($source_img, $target); //以 GIF 格式将图像输出到浏览器或文件
                    break;
                case 2 :
                    imagejpeg($source_img, $target, $this->w_quality); //以 JPEG 格式将图像输出到浏览器或文件
                    break;
                case 3 :
                    imagepng($source_img, $target); //以 PNG 格式将图像输出到浏览器或文件
                    break;
                default :
                    return;
            }
            if(isset($water_info))
            {
                unset($water_info); //销毁
            }
            if(isset($water_img))
            {
                imagedestroy($water_img); //销毁
            }
            unset($source_info);
            imagedestroy($source_img);
            return true;
        }
        //gd库必须存在，后缀为jpg|jpeg|gif|png，文件存在，imagecreatefromjpeg或者imagecreatefromgif存在
        function check($image)
        {
            return extension_loaded('gd') &&
            preg_match("/\.(JPG|JPEG|PNG|GIF|jpg|jpeg|gif|png)/i", $image, $m) &&
            file_exists($image) &&
            function_exists('imagecreatefrom'.($m[1] == 'jpg' ? 'jpeg' : $m[1]));
            //imagecreatefromjpeg
            //imagecreatefromgif
            //imagecreatefrompng
        }
    }

    /**
     缩略图
    1.新建一个图像资源 通过 imagecreatefromgif imagecreatefromjpeg imagecreatefrompng
    2.imagecopyresampled 拷贝图像，并调整大小

    水印：图片水印，文字水印
    1. 创建图像
    2.加水印
    图片水印：imagecopymerge 把2张图合并在一起
    文字水印：imagettftext  向图像写入文字


    */
    error_reporting(0);
    $hostdir = dirname(__FILE__);
    $filesnames = scandir($hostdir.'/desktop');
    $img = new image();
    foreach($filesnames as $name){
        if($name != '.' && $name != '..'){
            $imgPath = $hostdir.'/desktop/';
            $imgsize = getimagesize($imgPath.$name);
            $imgInfo = explode('.',$name);
            $imginfo2 = explode('_',$imgInfo[0]);
            if($imginfo2[count($imginfo2)-1] != 'small'){
                $img_small = $imgPath.$imgInfo[0].'_small.'.$imgInfo[1];
                $img->thumb2($imgPath.$name,$img_small,'',$imgsize[0]/4,$imgsize[1]/4);
            }
        }
    }

等比例, PHP