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。dedecms5.6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;}//[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;}dedecms5.7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; }}
