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Q c e ? ,的缩略图大小不起作用啊，这样严重影响网站N Q 7 B P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inH m &clude/image.func.php文件，该文件在dedq v @ S \ . ? kecms5.6/5.7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/c d 7 J n d V U

如果你使用的是dedecms5.7，打开目录/include/hel] E M . 5 I t J jpers/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。

dedecms_ b L v e n5.6版image.func.phpu # H $ M * ;修改方Y m _ [ t ? x E法（直接替换原来方法）

/* g ] E l ~ c/[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)

fun% Q J 3 q d @ction ImageResizei 1 M K #($srcFile, $toW, $toH, $toFile = "") {
global $cfg_photo_: . * \ g M \ wtype;
if ($toFile == "") {
$toq f - z w 5 0File = $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_ph& x :oto_type['jpeg']) {
return false;
}
$im = imagecreatefromjpeg($srcFile);
br_ \ 1 9eak;
caseO % V 3:
if (!$cfg_photo_type['png']) {
return false;
}
$im = imagecreatefrompng($srcFile);
break;
case 6:
if (!$cfg_photo_type['bmp']) {
return false;u c V C M g R c ?
}
$im = imagecreatefromwX L ` f V ; nbmp($srcFile);
break;
}
$srcW = ImageSX($im);
$srcH = ImageSY($im);
iS ( v A 8 5 1 If ($srcW <= $toW && $srcH <= $toH) {
retv P 6 2urn true;
}
//缩略生成并裁剪
$newW = $toH * $srcW / $srcH;
$newH = $toW * $srcH / $srcW;
if ($/ j b O XnewH &gt;= $toH) {
$ftoW = $toW;
$ftoH = $` ^ $ A 9 ] 9newH;
} elsey 3 F { X {
$ftoW = $newW;
$ftoH = $toH;
}
iH { t @f ($srcW > $toW || $srcH >C a 7 { 1 z ! $toH) {
if (function_exists("imagecreatetruecolor")) {
@$ni = imagecreatetru. & S $ y % 7 4 -ecolor($ftoW, $ftoH);
if ($ni) {
imagecopyresampled($ni, $im? } y a % f \ 9, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
}b ~ 5 else {
$ni = imagecreate(M 0 ~ G T ? n$ftoW, $ftoH);
iman 8 T AgecoL b B ; n ~pyresized($ni, $im, 0, 0, 0, 0, $ftoW, $fto$ k H . J t p m =H, $srcW, $srcH);
}
} else {
$ni = imagecreate($ftoW, $ftoH);
imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $sH % 8 ) 6 4 ircW, $srcH);
}
//裁剪? f 1 ) * w : -图片成标准缩略图
$new_imgx = imagecreateS L _ ( Z \ [ +truecolor($to\ , d WW, $toH);
if ($newH >= $toH) {
imagecopyresampled($new_imgx, $ni, 0, 0, 0, ($newH – $toH) / 2, $toW, $toH, $toW, $toH);
} else {
imagecopyresampled($new_imgx, $ni, 0, 0, ($newW9 _ ; [ l N – $toW) / 2, 0, $D d z } \ ,toW, $toH, $toW, $toH);
}
switch ($srcInfo[2]) {
case 1:
imagegif($new_ima t K ` h [ ! a lgx, $toFile);
break;
case 2:
imagejpeg($new_imgx, $toFile, 85);
break;
casv K p ke 3:
imagepng($new_imgx, $toFile);
break;
case 6:
imagebmG v 2 \p($new_imgx, $toFile);
break;
default:
return false;
}
imagedestroy($new_imgx);
imagedestroy($no Y ; u 5 f !i);
}
imagedestroy($im);
return tr\ G x h Due;
}
//[2020-11-04]:解决缩略图缩放变形问题! ~ 8 z(宽度、高度为后台设置宽高)
function Imager ? } O RResize($srcFile, $toW, $toH, $toFile = "") {
gl& , t 8 *obal $cfg_photo_type;
if ($toFile == "") {
$toFile = $srcFile;
}
$info =d B } "";
$srcInfY / - h 6 P 5o = GetImageSize($srcFile, $info);
switch ($srcInfo[2]) {
case 1:
if (!$cfg_photo_type['gif']) {
return false;
}
$3 f a n g V Qim = imagecreatefromgif($srcFile);
break;
case 2:
if (!$cfg_photo_type['jpeg']) {
return false;
}
$im = imagecreatefromjpegm | . E Y &($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 <k d ,= $toW &amp;& $V 1 o | *srcH <= $toH) {
return tr+ # ) xue;
}
//c } ) U ~缩略生成并裁剪
$newW = $toH * $srcW / $srcH;
$newH = $toW * $srcH / $srcW;
if ($newH &gt;= $toH) {
$ftoW = $tp 6 ] k L ( q VoW;
$ftoH = $newH;
} else2 m F B E {
$ftoW = $newWc K C { u ^;
$ftoH = $toH;
}
if ($s; q U yrcW &gt; $toW |# C `| $srcH > $toH); d 3 {
if (funct/ L ~ U Sion_exists("] { }imagecreatetruc } $ ) k ] Eecolor")) {
@$ni = imagecreatetruecolor(8 b j g C$ftoW, $ftoH);
if ($ni) {
imagecopyresampled($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
} else {
$ni = imagecreate($ftoW, $fh 5 A ( N s ltoH);
imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
}
} else {
$ni = imagecreate# ! g ( Y v # i /($ftoW, $ftoH);
imagecopx ) v R B ~ ! R nyresized($ni, $im,7 $ ? a 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH)I k _ D P 4 v h;
}
//裁剪图片成标* ` O O o % @ %准缩略图
$ne4 | 7 \w_imgx = imagecreatetruecolor($toW, $toH);
if ($newH >= $toH) {2 M x / q P o G
imagecopyresampled($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, $toH)U S | w @ 9 K T;
}
switch ($srcInfo[2]) {
case 1G } b R ; \ / .:
imagegif($new_imgx, $toFile);
break;
case 2:
imagejpeg($new_imgx, $toFile, 85);
breq L F H [ _ak;
case 3:` t e . v q F #
imagepnM L v r 1 1g($new_imgx, $toFile);
break;
case 6:
imagebmp($new_imgx, $toFile);
break;
default:
return false;
}
imagedestroy($new_im0 v 6 = N # ( Xgx);^ 5 X
imagedestroy($ni);
}
i! a / p + = \ ^ ]magedestroy($im);
return true;
}
dedecms5.\ r 2 B l ] N7版image- , 9 } B - # W 7.helper.php修改方法：
if (!fuH * Y 7 inction_exists(j x N 7 S s O w'ImageResize'? % b)) {
funcI | ) 9 s 6tion ImageResize($srcu b ; [ ~ 3File, $5 m h 6 j ) C !toW, $toH, $toFile = "") {
global $cfg_photo_type;
if ($toFile == "") {
$toFile = $srcFile;
}
$info = "";
$srcInfo = GetImageSize($srcFile, $info);
switch ($srcInfo[2]) {
ca: H P ( m N K zse 1:
if (!$cfg_photo_type['gif']) {
return false;
}
$im = imagec% C o y U [ &reatefromgif($srcFile);
break;
case 2:
if (!$c? [ L 4 :fg_photo_type['jpeg']) {
return false;
}
$im = imagecreatefromjpeg($srcFile);
break;
case 3:
if (!$cfg_photo_1 ] \ r 0 / 7type['png']) {
returnt 7 a E w T $ 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 ($srch 7 kW <= $toW && $srcH <= $toH) {
return true;
}
//缩略生成并裁剪
$newW = $toH * $srcW / $srcH;
$newH = $toW * $srcH / $src2 f b s | 1 A j HW;
if ($newH >= $tZ 1 X FoH) {
$ftoW = $toW;
$ftoH = $newH;
} else {
$fm J : [ ! \ 1 Y *toi j $ r c 8W = $newW;\ c = H E ` t ] }
$ftoH = $toH;
}
if ($srcW > $toW || $srcH > $toH) {
if (function_exists("imagecreatetruecolor")) {
@$ni = imagea W F E k :createtruecolor($ftoW,8 C ] $ftoH);
if ($n\ a , g E j \i) {
imageco. u o - @pyresampled($ni, $im, 0, 0, 0, 0, $ftoW, $a A g t i + ! } uftoH, $sJ q ] N ; NrcW,_ / T ` 0 4 S O $ $srcH);
} else {
$ni = imagecreate($ftoW` x I, $ftoH);
imagecopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH);
}
} else {
$ni = imagecreate($ftoW, $ftoH);
imag\ ] ! 2 k / | ye] = - I Rcopyresized($ni, $im, 0, 0, 0, 0, $ftoW, $ftoH, $srcW, $srcH\ 5 Z ? O u);
}
//裁剪图片成标准缩略图
$new_imgx = imagecreatetruecolor($toW, $toH);
if ($newH &gt;= $toH) {
imagecopyresampled($new\ J Z : ` ^ U_imgx, $ni, 0, 0, 0, ($newH – $toH) / 2, $toW, $toH, $toW, $toH);
} else {
imagecopyresampk } % * A Z 3led($new_imgx, $) x { z S 4 Gni, 0, 0, ($newW – $toW) / 2, 0, $toW, $toH, $toW, $t, ` } FoH);
}
switch ($srcInfo[2]) {
case 1:
imagegi6 O ; Of($new_imgx, $toFile);
break;
casR E _ Q le 2:
imagejpeg($new_imgx, $toFile, 85);
br9 } ( teak# # 9 # N j 9;
case 3:T O # o s H o z 5
imagepng($new_imgx, $tow E f j J ] 3 :File);
break;
case 6:
imagebmp($new_imgx, $toFile);
break;
default:
return false;
}
imagedestroy($new_imgx);
imagedestro3 ) ? cy($ni)7 + A;
}
imagedeO E j \ k g _ # sstrc k aoy($im);
return trup ^ _ q K = de;
}
}