解决DedeCMS使用中缩略图变形的问题（改配置文件或自定义尺寸缩略图）

if (!function_exists('ImageResize')) {
    function ImageResize($srcFile, $toW, $toH, $toFile = "") {
        global $cfg_photo_type;
        if ($toFile == "") {
            $toFile = $srcFile;
        }
        $info = "";
        $srcInfo = GetImageSize($srcFile, $info);
        switch ($srcInfo[2]) {
        case 1:
            if (!$cfg_photo_type['gif']) {
                return false;
            }
            $im = imagecreatefromgif($srcFile);
            break;
        case 2:
            if (!$cfg_photo_type['jpeg']) {
                return false;
            }
            $im = imagecreatefromjpeg($srcFile);
            break;
        case 3:
            if (!$cfg_photo_type['png']) {
                return false;
            }
            $im = imagecreatefrompng($srcFile);
            break;
        case 6:
            if (!$cfg_photo_type['bmp']) {
                return false;
            }
            $im = imagecreatefromwbmp($srcFile);
            break;
        }
        $srcW = ImageSX($im);
        $srcH = ImageSY($im);
        if ($srcW <= $toW && $srcH <= $toH) {
            return true;
        }
        //缩略生成并裁剪
        $newW = $toH * $srcW / $srcH;
        $newH = $toW * $srcH / $srcW;
        if ($newH >= $toH) {
            $ftoW = $toW;
            $ftoH = $newH;
        } else {
            $ftoW = $newW;
            $ftoH = $toH;
        }
        if ($srcW > $toW || $srcH > $toH) {
            if (function_exists("imagecreatetruecolor")) {
        @$ni = imagecreatetruecolor($ftoW, $ftoH);
                if ($ni) {
                    imagecopyresampled($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
                } else {
                    $ni = imagecreate($ftoW, $ftoH);
                    imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
                }
            } else {
                $ni = imagecreate($ftoW, $ftoH);
                imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
            }
            //裁剪图片成标准缩略图
            $new_imgx = imagecreatetruecolor($toW, $toH);
            if ($newH >= $toH) {
                imagecopyresampled($new_imgx, $ni, 0, 0, 0, ($newH - $toH) / 2, $toW, $toH, $toW, $toH);
            } else {
                imagecopyresampled($new_imgx, $ni, 0, 0, ($newW - $toW) / 2, 0, $toW, $toH, $toW, $toH);
            }
            switch ($srcInfo[2]) {
            case 1:
                imagegif($new_imgx, $toFile);
                break;
            case 2:
                imagejpeg($new_imgx, $toFile, 85);
                break;
            case 3:
                imagepng($new_imgx, $toFile);
                break;
            case 6:
                imagebmp($new_imgx, $toFile);
                break;
            default:
                return false;
            }
            imagedestroy($new_imgx);
            imagedestroy($ni);
        }
        imagedestroy($im);
        return true;
    }
}