PHP画像透かしクラス

<?php
class ThumbHandler {
        var $dst_img; // 目标文件
        var $h_src; // 图片资源句柄
        var $h_dst; // 新图句柄
        var $h_mask; // 水印句柄
        var $img_create_quality = 100; // 图片生成质量
        var $img_display_quality = 80; // 图片显示质量,默认为75
        var $img_scale = 0; // 图片缩放比例
        var $src_w = 0; // 原图宽度
        var $src_h = 0; // 原图高度
        var $dst_w = 0; // 新图总宽度
        var $dst_h = 0; // 新图总高度
        var $fill_w; // 填充图形宽
        var $fill_h; // 填充图形高
        var $copy_w; // 拷贝图形宽
        var $copy_h; // 拷贝图形高
        var $src_x = 0; // 原图绘制起始横坐标
        var $src_y = 0; // 原图绘制起始纵坐标
        var $start_x; // 新图绘制起始横坐标
        var $start_y; // 新图绘制起始纵坐标
        var $mask_word; // 水印文字
        var $mask_img; // 水印图片
        var $mask_pos_x = 0; // 水印横坐标
        var $mask_pos_y = 0; // 水印纵坐标
        var $mask_offset_x = 5; // 水印横向偏移
        var $mask_offset_y = 5; // 水印纵向偏移
        var $font_w; // 水印字体宽
        var $font_h; // 水印字体高
        var $mask_w; // 水印宽
        var $mask_h; // 水印高
        var $mask_font_color = "#ffffff"; // 水印文字颜色
        var $mask_font = 2; // 水印字体
        var $font_size; // 尺寸
        var $mask_position = 0; // 水印位置
        var $mask_img_pct = 50; // 图片合并程度,值越大，合并程序越低
        var $mask_txt_pct = 50; // 文字合并程度,值越小，合并程序越低
        var $img_border_size = 0; // 图片边框尺寸
        var $img_border_color; // 图片边框颜色
        var $_flip_x = 0; // 水平翻转次数
        var $_flip_y = 0; // 垂直翻转次数
       

        var $cut_type = 0; // 剪切类型
       

        var $img_type; // 文件类型
       

        // 文件类型定义,并指出了输出图片的函数
        var $all_type = array ("jpg" => array ("output" => "imagejpeg" ), "gif" => array ("output" => "imagegif" ), "png" => array ("output" => "imagepng" ), "wbmp" => array ("output" => "image2wbmp" ), "jpeg" => array ("output" => "imagejpeg" ) );
        
        /**
         * 构造函数
         */
        function ThumbHandler() {
                $this->mask_font_color = "#ffffff";
                $this->font = 2;
                $this->font_size = 12;
        }
        
        /**
         * 取得图片的宽
         */
        function getImgWidth($src) {
                return imagesx ( $src );
        }
        
        /**
         * 取得图片的高
         */
        function getImgHeight($src) {
                return imagesy ( $src );
        }
        
        /**
         * 设置图片生成路径
         *
         * @param    string    $src_img   图片生成路径
         */
        function setSrcImg($src_img, $img_type = null) {
                echo $img_type;
                if (! file_exists ( $src_img )) {
                        die ( "图片不存在" );
                }
                
                if (! empty ( $img_type )) {
                        $this->img_type = $img_type;
                } else {
                        $this->img_type = $this->_getImgType ( $src_img );
                }
                
                $this->_checkValid ( $this->img_type );
                
                // file_get_contents函数要求php版本>4.3.0
                $src = '';
                if (function_exists ( "file_get_contents" )) {
                        $src = file_get_contents ( $src_img );
                } else {
                        $handle = fopen ( $src_img, "r" );
                        while ( ! feof ( $handle ) ) {
                                $src .= fgets ( $fd, 4096 );
                        }
                        fclose ( $handle );
                }
                if (empty ( $src )) {
                        die ( "图片源为空" );
                }
                $this->h_src = @ImageCreateFromString ( $src );
                $this->src_w = $this->getImgWidth ( $this->h_src );
                $this->src_h = $this->getImgHeight ( $this->h_src );
        }
        
        /**
         * 设置图片生成路径
         *
         * @param    string    $dst_img   图片生成路径
         */
        function setDstImg($dst_img) {
                $arr = explode ( '/', $dst_img );
                $last = array_pop ( $arr );
                $path = implode ( '/', $arr );
                $this->_mkdirs ( $path );
                $this->dst_img = $dst_img;
        }
        
        /**
         * 设置图片的显示质量
         *
         * @param    string      $n    质量
         */
        function setImgDisplayQuality($n) {
                $this->img_display_quality = ( int ) $n;
        }
        
        /**
         * 设置图片的生成质量
         *
         * @param    string      $n    质量
         */
        function setImgCreateQuality($n) {
                $this->img_create_quality = ( int ) $n;
        }
        
        /**
         * 设置文字水印
         *
         * @param    string     $word    水印文字
         * @param    integer    $font    水印字体
         * @param    string     $color   水印字体颜色
         */
        function setMaskWord($word) {
                $this->mask_word .= $word;
        }
        
        /**
         * 设置字体颜色
         *
         * @param    string     $color    字体颜色
         */
        function setMaskFontColor($color = "#ffffff") {
                $this->mask_font_color = $color;
        }
        
        /**
         * 设置水印字体
         *
         * @param    stringinteger    $font    字体
         */
        function setMaskFont($font = 2) {
                if (! is_numeric ( $font ) && ! file_exists ( $font )) {
                        die ( "字体文件不存在" );
                }
                $this->font = $font;
        }
        
        /**
         * 设置文字字体大小,仅对truetype字体有效
         */
        function setMaskFontSize($size = "12") {
                $this->font_size = $size;
        }
        
        /**
         * 设置图片水印
         *
         * @param    string    $img     水印图片源
         */
        function setMaskImg($img) {
                $this->mask_img = $img;
        }
        
        /**
         * 设置水印横向偏移
         *
         * @param    integer     $x    横向偏移量
         */
        function setMaskOffsetX($x) {
                $this->mask_offset_x = ( int ) $x;
        }
        
        /**
         * 设置水印纵向偏移
         *
         * @param    integer     $y    纵向偏移量
         */
        function setMaskOffsetY($y) {
                $this->mask_offset_y = ( int ) $y;
        }
        
        /**
         * 指定水印位置
         *
         * @param    integer     $position    位置,1:左上,2:左下,3:右上,0/4:右下
         */
        function setMaskPosition($position = 0) {
                $this->mask_position = ( int ) $position;
        }
        
        /**
         * 设置图片合并程度
         *
         * @param    integer     $n    合并程度
         */
        function setMaskImgPct($n) {
                $this->mask_img_pct = ( int ) $n;
        }
        
        /**
         * 设置文字合并程度
         *
         * @param    integer     $n    合并程度
         */
        function setMaskTxtPct($n) {
                $this->mask_txt_pct = ( int ) $n;
        }
        
        /**
         * 设置缩略图边框
         *
         * @param    (类型)     (参数名)    (描述)
         */
        function setDstImgBorder($size = 1, $color = "#000000") {
                $this->img_border_size = ( int ) $size;
                $this->img_border_color = $color;
        }
        
        /**
         * 水平翻转
         */
        function flipH() {
                $this->_flip_x ++;
        }
        
        /**
         * 垂直翻转
         */
        function flipV() {
                $this->_flip_y ++;
        }
        
        /**
         * 设置剪切类型
         *
         * @param    (类型)     (参数名)    (描述)
         */
        function setCutType($type) {
                $this->cut_type = ( int ) $type;
        }
        
        /**
         * 设置图片剪切
         *
         * @param    integer     $width    矩形剪切
         */
        function setRectangleCut($width, $height) {
                $this->fill_w = ( int ) $width;
                $this->fill_h = ( int ) $height;
        }
        
        /**
         * 设置源图剪切起始坐标点
         *
         * @param    (类型)     (参数名)    (描述)
         */
        function setSrcCutPosition($x, $y) {
                $this->src_x = ( int ) $x;
                $this->src_y = ( int ) $y;
        }
        
        /**
         * 创建图片,主函数
         * @param    integer    $a     当缺少第二个参数时，此参数将用作百分比，
         *                             否则作为宽度值
         * @param    integer    $b     图片缩放后的高度
         */
        function createImg($a, $b = null) {
                $num = func_num_args ();
                if (1 == $num) {
                        $r = ( int ) $a;
                        if ($r < 1) {
                                die ( "图片缩放比例不得小于1" );
                        }
                        $this->img_scale = $r;
                        $this->_setNewImgSize ( $r );
                }
                
                if (2 == $num) {
                        $w = ( int ) $a;
                        $h = ( int ) $b;
                        if (0 == $w) {
                                die ( "目标宽度不能为0" );
                        }
                        if (0 == $h) {
                                die ( "目标高度不能为0" );
                        }
                        $this->_setNewImgSize ( $w, $h );
                }
                
                if ($this->_flip_x % 2 != 0) {
                        $this->_flipH ( $this->h_src );
                }
                
                if ($this->_flip_y % 2 != 0) {
                        $this->_flipV ( $this->h_src );
                }
                $this->_createMask ();
                $this->_output ();
                
                // 释放
                if (imagedestroy ( $this->h_src ) && imagedestroy ( $this->h_dst )) {
                        Return true;
                } else {
                        Return false;
                }
        }
        
        /**
         * 生成水印,调用了生成水印文字和水印图片两个方法
         */
        function _createMask() {
                if ($this->mask_word) {
                        // 获取字体信息
                        $this->_setFontInfo ();
                        
                        if ($this->_isFull ()) {
                                die ( "水印文字过大" );
                        } else {
                                $this->h_dst = imagecreatetruecolor ( $this->dst_w, $this->dst_h );
                                $white = ImageColorAllocate ( $this->h_dst, 255, 255, 255 );
                                imagefilledrectangle ( $this->h_dst, 0, 0, $this->dst_w, $this->dst_h, $white ); // 填充背景色
                                $this->_drawBorder ();
                                imagecopyresampled ( $this->h_dst, $this->h_src, $this->start_x, $this->start_y, $this->src_x, $this->src_y, $this->fill_w, $this->fill_h, $this->copy_w, $this->copy_h );
                                $this->_createMaskWord ( $this->h_dst );
                        }
                }
                
                if ($this->mask_img) {
                        $this->_loadMaskImg (); //加载时，取得宽高
                       

                        if ($this->_isFull ()) {
                                // 将水印生成在原图上再拷
                                $this->_createMaskImg ( $this->h_src );
                                $this->h_dst = imagecreatetruecolor ( $this->dst_w, $this->dst_h );
                                $white = ImageColorAllocate ( $this->h_dst, 255, 255, 255 );
                                imagefilledrectangle ( $this->h_dst, 0, 0, $this->dst_w, $this->dst_h, $white ); // 填充背景色
                                $this->_drawBorder ();
                                imagecopyresampled ( $this->h_dst, $this->h_src, $this->start_x, $this->start_y, $this->src_x, $this->src_y, $this->fill_w, $this->start_y, $this->copy_w, $this->copy_h );
                        } else {
                                // 创建新图并拷贝
                                $this->h_dst = imagecreatetruecolor ( $this->dst_w, $this->dst_h );
                                $white = ImageColorAllocate ( $this->h_dst, 255, 255, 255 );
                                imagefilledrectangle ( $this->h_dst, 0, 0, $this->dst_w, $this->dst_h, $white ); // 填充背景色
                                $this->_drawBorder ();
                                imagecopyresampled ( $this->h_dst, $this->h_src, $this->start_x, $this->start_y, $this->src_x, $this->src_y, $this->fill_w, $this->fill_h, $this->copy_w, $this->copy_h );
                                $this->_createMaskImg ( $this->h_dst );
                        }
                }
                
                if (empty ( $this->mask_word ) && empty ( $this->mask_img )) {
                        $this->h_dst = imagecreatetruecolor ( $this->dst_w, $this->dst_h );
                        $white = ImageColorAllocate ( $this->h_dst, 255, 255, 255 );
                        imagefilledrectangle ( $this->h_dst, 0, 0, $this->dst_w, $this->dst_h, $white ); // 填充背景色
                        $this->_drawBorder ();
                        
                        imagecopyresampled ( $this->h_dst, $this->h_src, $this->start_x, $this->start_y, $this->src_x, $this->src_y, $this->fill_w, $this->fill_h, $this->copy_w, $this->copy_h );
                }
        }
        
        /**
         * 画边框
         */
        function _drawBorder() {
                if (! empty ( $this->img_border_size )) {
                        $c = $this->_parseColor ( $this->img_border_color );
                        $color = ImageColorAllocate ( $this->h_src, $c [0], $c [1], $c [2] );
                        imagefilledrectangle ( $this->h_dst, 0, 0, $this->dst_w, $this->dst_h, $color ); // 填充背景色
                }
        }
        
        /**
         * 生成水印文字
         */
        function _createMaskWord($src) {
                $this->_countMaskPos ();
                $this->_checkMaskValid ();
                
                $c = $this->_parseColor ( $this->mask_font_color );
                $color = imagecolorallocatealpha ( $src, $c [0], $c [1], $c [2], $this->mask_txt_pct );
                
                if (is_numeric ( $this->font )) {
                        imagestring ( $src, $this->font, $this->mask_pos_x, $this->mask_pos_y, $this->mask_word, $color );
                } else {
                        imagettftext ( $src, $this->font_size, 0, $this->mask_pos_x, $this->mask_pos_y, $color, $this->font, $this->mask_word );
                }
        }
        
        /**
         * 生成水印图
         */
        function _createMaskImg($src) {
                $this->_countMaskPos ();
                $this->_checkMaskValid ();
                imagecopymerge ( $src, $this->h_mask, $this->mask_pos_x, $this->mask_pos_y, 0, 0, $this->mask_w, $this->mask_h, $this->mask_img_pct );
                
                imagedestroy ( $this->h_mask );
        }
        
        /**
         * 加载水印图
         */
        function _loadMaskImg() {
                $mask_type = $this->_getImgType ( $this->mask_img );
                $this->_checkValid ( $mask_type );
                
                // file_get_contents函数要求php版本>4.3.0
                $src = '';
                if (function_exists ( "file_get_contents" )) {
                        $src = file_get_contents ( $this->mask_img );
                } else {
                        $handle = fopen ( $this->mask_img, "r" );
                        while ( ! feof ( $handle ) ) {
                                $src .= fgets ( $fd, 4096 );
                        }
                        fclose ( $handle );
                }
                if (empty ( $this->mask_img )) {
                        die ( "水印图片为空" );
                }
                $this->h_mask = ImageCreateFromString ( $src );
                $this->mask_w = $this->getImgWidth ( $this->h_mask );
                $this->mask_h = $this->getImgHeight ( $this->h_mask );
        }
        
        /**
         * 图片输出
         */
        function _output() {
                $img_type = $this->img_type;
                $func_name = $this->all_type [$img_type] ['output'];
                if (function_exists ( $func_name )) {
                        // 判断浏览器,若是IE就不发送头
                        if (isset ( $_SERVER ['HTTP_USER_AGENT'] )) {
                                $ua = strtoupper ( $_SERVER ['HTTP_USER_AGENT'] );
                                if (! preg_match ( '/^.*MSIE.*\)$/i', $ua )) {
                                        header ( "Content-type:$img_type" );
                                }
                        }
                        $func_name ( $this->h_dst, $this->dst_img, $this->img_display_quality );
                } else {
                        Return false;
                }
        }
        
        /**
         * 分析颜色
         *
         * @param    string     $color    十六进制颜色
         */
        function _parseColor($color) {
                $arr = array ();
                for($ii = 1; $ii < strlen ( $color ); $ii ++) {
                        $arr [] = hexdec ( substr ( $color, $ii, 2 ) );
                        $ii ++;
                }
                
                Return $arr;
        }
        
        /**
         * 计算出位置坐标
         */
        function _countMaskPos() {
                if ($this->_isFull ()) {
                        switch ($this->mask_position) {
                                case 1 :
                                        // 左上
                                        $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                                        $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                                        break;
                                
                                case 2 :
                                        // 左下
                                        $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                                        $this->mask_pos_y = $this->src_h - $this->mask_h - $this->mask_offset_y;
                                        break;
                                
                                case 3 :
                                        // 右上
                                        $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;
                                        $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                                        break;
                                
                                case 4 :
                                        // 右下
                                        $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;
                                        $this->mask_pos_y = $this->src_h - $this->mask_h - $this->mask_offset_y;
                                        break;
                                
                                default :
                                        // 默认将水印放到右下,偏移指定像素
                                        $this->mask_pos_x = $this->src_w - $this->mask_w - $this->mask_offset_x;
                                        $this->mask_pos_y = $this->src_h - $this->mask_h - $this->mask_offset_y;
                                        break;
                        }
                } else {
                        switch ($this->mask_position) {
                                case 1 :
                                        // 左上
                                        $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                                        $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                                        break;
                                
                                case 2 :
                                        // 左下
                                        $this->mask_pos_x = $this->mask_offset_x + $this->img_border_size;
                                        $this->mask_pos_y = $this->dst_h - $this->mask_h - $this->mask_offset_y - $this->img_border_size;
                                        break;
                                
                                case 3 :
                                        // 右上
                                        $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;
                                        $this->mask_pos_y = $this->mask_offset_y + $this->img_border_size;
                                        break;
                                
                                case 4 :
                                        // 右下
                                        $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;
                                        $this->mask_pos_y = $this->dst_h - $this->mask_h - $this->mask_offset_y - $this->img_border_size;
                                        break;
                                
                                default :
                                        // 默认将水印放到右下,偏移指定像素
                                        $this->mask_pos_x = $this->dst_w - $this->mask_w - $this->mask_offset_x - $this->img_border_size;
                                        $this->mask_pos_y = $this->dst_h - $this->mask_h - $this->mask_offset_y - $this->img_border_size;
                                        break;
                        }
                }
        }
        
        /**
         * 设置字体信息
         */
        function _setFontInfo() {
                if (is_numeric ( $this->font )) {
                        $this->font_w = imagefontwidth ( $this->font );
                        $this->font_h = imagefontheight ( $this->font );
                        
                        // 计算水印字体所占宽高
                        $word_length = strlen ( $this->mask_word );
                        $this->mask_w = $this->font_w * $word_length;
                        $this->mask_h = $this->font_h;
                } else {
                        $arr = imagettfbbox ( $this->font_size, 0, $this->font, $this->mask_word );
                        $this->mask_w = abs ( $arr [0] - $arr [2] );
                        $this->mask_h = abs ( $arr [7] - $arr [1] );
                }
        }
        
        /**
         * 设置新图尺寸
         *
         * @param    integer     $img_w   目标宽度
         * @param    integer     $img_h   目标高度
         */
        function _setNewImgSize($img_w, $img_h = null) {
                $num = func_num_args ();
                if (1 == $num) {
                        $this->img_scale = $img_w; // 宽度作为比例
                        $this->fill_w = round ( $this->src_w * $this->img_scale / 100 ) - $this->img_border_size * 2;
                        $this->fill_h = round ( $this->src_h * $this->img_scale / 100 ) - $this->img_border_size * 2;
                        
                        // 源文件起始坐标
                        $this->src_x = 0;
                        $this->src_y = 0;
                        $this->copy_w = $this->src_w;
                        $this->copy_h = $this->src_h;
                        
                        // 目标尺寸
                        $this->dst_w = $this->fill_w + $this->img_border_size * 2;
                        $this->dst_h = $this->fill_h + $this->img_border_size * 2;
                }
                
                if (2 == $num) {
                        $fill_w = ( int ) $img_w - $this->img_border_size * 2;
                        $fill_h = ( int ) $img_h - $this->img_border_size * 2;
                        if ($fill_w < 0  $fill_h < 0) {
                                die ( "图片边框过大，已超过了图片的宽度" );
                        }
                        $rate_w = $this->src_w / $fill_w;
                        $rate_h = $this->src_h / $fill_h;
                        
                        switch ($this->cut_type) {
                                case 0 :
                                        // 如果原图大于缩略图，产生缩小，否则不缩小
                                        if ($rate_w < 1 && $rate_h < 1) {
                                                $this->fill_w = ( int ) $this->src_w;
                                                $this->fill_h = ( int ) $this->src_h;
                                        } else {
                                                if ($rate_w >= $rate_h) {
                                                        $this->fill_w = ( int ) $fill_w;
                                                        $this->fill_h = round ( $this->src_h / $rate_w );
                                                } else {
                                                        $this->fill_w = round ( $this->src_w / $rate_h );
                                                        $this->fill_h = ( int ) $fill_h;
                                                }
                                        }
                                        
                                        $this->src_x = 0;
                                        $this->src_y = 0;
                                        
                                        $this->copy_w = $this->src_w;
                                        $this->copy_h = $this->src_h;
                                        
                                        // 目标尺寸
                                        $this->dst_w = $this->fill_w + $this->img_border_size * 2;
                                        $this->dst_h = $this->fill_h + $this->img_border_size * 2;
                                        break;
                                
                                // 自动裁切
                                case 1 :
                                        // 如果图片是缩小剪切才进行操作
                                        if ($rate_w >= 1 && $rate_h >= 1) {
                                                if ($this->src_w > $this->src_h) {
                                                        $src_x = round ( $this->src_w - $this->src_h ) / 2;
                                                        $this->setSrcCutPosition ( $src_x, 0 );
                                                        $this->setRectangleCut ( $fill_h, $fill_h );
                                                        
                                                        $this->copy_w = $this->src_h;
                                                        $this->copy_h = $this->src_h;
                                                
                                                } elseif ($this->src_w < $this->src_h) {
                                                        $src_y = round ( $this->src_h - $this->src_w ) / 2;
                                                        $this->setSrcCutPosition ( 0, $src_y );
                                                        $this->setRectangleCut ( $fill_w, $fill_h );
                                                        
                                                        $this->copy_w = $this->src_w;
                                                        $this->copy_h = $this->src_w;
                                                } else {
                                                        $this->setSrcCutPosition ( 0, 0 );
                                                        $this->copy_w = $this->src_w;
                                                        $this->copy_h = $this->src_w;
                                                        $this->setRectangleCut ( $fill_w, $fill_h );
                                                }
                                        } else {
                                                $this->setSrcCutPosition ( 0, 0 );
                                                $this->setRectangleCut ( $this->src_w, $this->src_h );
                                                
                                                $this->copy_w = $this->src_w;
                                                $this->copy_h = $this->src_h;
                                        }
                                        
                                        // 目标尺寸
                                        $this->dst_w = $this->fill_w + $this->img_border_size * 2;
                                        $this->dst_h = $this->fill_h + $this->img_border_size * 2;
                                        
                                        break;
                                
                                // 手工裁切
                                case 2 :
                                        $this->copy_w = $this->fill_w;
                                        $this->copy_h = $this->fill_h;
                                        
                                        // 目标尺寸
                                        $this->dst_w = $this->fill_w + $this->img_border_size * 2;
                                        $this->dst_h = $this->fill_h + $this->img_border_size * 2;
                                        
                                        break;
                                default :
                                        break;
                        
                        }
                }
                
                // 目标文件起始坐标
                $this->start_x = $this->img_border_size;
                $this->start_y = $this->img_border_size;
        }
        
        /**
         * 检查水印图是否大于生成后的图片宽高
         */
        function _isFull() {
                Return ($this->mask_w + $this->mask_offset_x > $this->fill_w  $this->mask_h + $this->mask_offset_y > $this->fill_h) ? true : false;
        }
        
        /**
         * 检查水印图是否超过原图
         */
        function _checkMaskValid() {
                if ($this->mask_w + $this->mask_offset_x > $this->src_w  $this->mask_h + $this->mask_offset_y > $this->src_h) {
                        die ( "水印图片尺寸大于原图，请缩小水印图" );
                }
        }
        
        /**
         * 取得图片类型
         *
         * @param    string     $file_path    文件路径
         */
        function _getImgType($file_path) {
                $type_list = array ("1" => "gif", "2" => "jpg", "3" => "png", "4" => "swf", "5" => "psd", "6" => "bmp", "15" => "wbmp" );
                if (file_exists ( $file_path )) {
                        $img_info = @getimagesize ( $file_path );
                        if (isset ( $type_list [$img_info [2]] )) {
                                Return $type_list [$img_info [2]];
                        }
                } else {
                        die ( "文件不存在,不能取得文件类型!" );
                }
        }
        
        /**
         * 检查图片类型是否合法,调用了array_key_exists函数，此函数要求
         * php版本大于4.1.0
         *
         * @param    string     $img_type    文件类型
         */
        function _checkValid($img_type) {
                if (! array_key_exists ( $img_type, $this->all_type )) {
                        Return false;
                }
        }
        
        /**
         * 按指定路径生成目录
         *
         * @param    string     $path    路径
         */
        function _mkdirs($path) {
                $adir = explode ( '/', $path );
                $dirlist = '';
                $rootdir = array_shift ( $adir );
                if (($rootdir != '.'  $rootdir != '..') && ! file_exists ( $rootdir )) {
                        @mkdir ( $rootdir );
                }
                foreach ( $adir as $key => $val ) {
                        if ($val != '.' && $val != '..') {
                                $dirlist .= "/" . $val;
                                $dirpath = $rootdir . $dirlist;
                                if (! file_exists ( $dirpath )) {
                                        @mkdir ( $dirpath );
                                        @chmod ( $dirpath, 0777 );
                                }
                        }
                }
        }
        
        /**
         * 垂直翻转
         *
         * @param    string     $src    图片源
         */
        function _flipV($src) {
                $src_x = $this->getImgWidth ( $src );
                $src_y = $this->getImgHeight ( $src );
                
                $new_im = imagecreatetruecolor ( $src_x, $src_y );
                for($y = 0; $y < $src_y; $y ++) {
                        imagecopy ( $new_im, $src, 0, $src_y - $y - 1, 0, $y, $src_x, 1 );
                }
                $this->h_src = $new_im;
        }
        
        /**
         * 水平翻转
         *
         * @param    string     $src    图片源
         */
        function _flipH($src) {
                $src_x = $this->getImgWidth ( $src );
                $src_y = $this->getImgHeight ( $src );
                
                $new_im = imagecreatetruecolor ( $src_x, $src_y );
                for($x = 0; $x < $src_x; $x ++) {
                        imagecopy ( $new_im, $src, $src_x - $x - 1, 0, $x, 0, 1, $src_y );
                }
                $this->h_src = $new_im;
        }
}?>