解决dedecms(5.6/5.7)缩略图缩放变形问题方法

解决dedecms(5.6/5.7)缩略图缩放变形问题方法，我们知道，dedecms缩略图是自动提取，相当于原图的等比例缩放了，比如后台设置缩略图的尺码为：120*90即为3:2的图片，但是假如内容里的大图尺码为300*300即1:1，这样生成出来的图片就会变形，直接后台设置的缩略图大小不起作用啊，这样严重影响网站美观，本文介绍通过修改dedecms生成缩略源码方法解决定问题。

打开include/image.func.php文件，该文件在dedecms5.6/5.7中所在的目录不一样，5.6中文件在/include/下，5.7中文件在/include/helpers/

如果你使用的是dedecms5.7，打开目录/include/helpers/找到image.helper.php文件。
如果你使用的是dedecms5.6，打开目录/include/找到image.func.php文件。

5.6版image.func.php修改方法（直接替换原来方法）

//[2020-11-04]:解决缩略图缩放变形问题(宽度、高度为后台设置宽高)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;}

5.7版image.helper.php修改方法

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;    }}

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