PHP generates thumbnails. The most compatible PHP function code to generate thumbnails. Modified version

Copy code The code is as follows:

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 "Your GD library cannot use GIF format images, please use Jpeg or PNG format!Return";
exit();
}
$im = ImageCreateFromGIF($srcFile);
break;
case 2:
if(!function_exists("imagecreatefromjpeg")){
echo "Your GD library cannot use images in jpeg format, please use images in other formats!Return ";
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);
}

The above introduces the modified version of the function code for generating thumbnails in PHP with the strongest compatibility, including the content of generating thumbnails in PHP. I hope it will be helpful to friends who are interested in PHP tutorials.