复制代码 代码如下:

function ImageResize($srcFile,$toW,$toH,$toFile="")

{

if($toFile==""){ $toFile = $srcFile; }

$info = "";

$data = GetImageSize($srcFile,$info);

switch ($data[2])

{

case 1:

if(!function_exists("imagecreatefromgif")){

echo "你的GD库不能使用GIF格式的图片，请使用Jpeg或PNG格式！<a href='javascript:go(-1);'>返回</a>";

exit();

}

$im = ImageCreateFromGIF($srcFile);

break;

case 2:

if(!function_exists("imagecreatefromjpeg")){

echo "你的GD库不能使用jpeg格式的图片，请使用其它格式的图片！<a href='javascript:go(-1);'>返回</a>";

exit();

}

$im = ImageCreateFromJpeg($srcFile);

break;

case 3:

$im = ImageCreateFromPNG($srcFile);

break;

}

$srcW=ImageSX($im);

$srcH=ImageSY($im);

$toWH=$toW/$toH;

$srcWH=$srcW/$srcH;

if($toWH<=$srcWH){

$ftoW=$toW;

$ftoH=$ftoW*($srcH/$srcW);

}

else{

$ftoH=$toH;

$ftoW=$ftoH*($srcW/$srcH);

}

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);

}

if(function_exists('imagejpeg')) ImageJpeg($ni,$toFile);

else ImagePNG($ni,$toFile);

ImageDestroy($ni);

}

ImageDestroy($im);

}