PHP code to generate thumbnail images based on requests and save them to the Linux image server-PHP Tutorial-php.cn

PHP code to generate thumbnail images based on requests and save them to the Linux image server

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Release： 2016-07-25 08:59:19

Original

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/**
* Thumbnail Image Linux Image Server
* edit bbs.it-home.org
*/
$picID=$_GET['imgID'];
$picTypes=".".$_GET['imgType'];
$picWidth= $_GET['ImgWidth'];
if($picID!="")
{
//The request is for a small picture
if($picWidth>0){
//If the small picture exists
if(file_exists($ picID."_".$picWidth.$picTypes))
{
outputImg($picID."_".$picWidth.$picTypes);
}else
{
if(file_exists($picID."_0".$ picTypes)){
//If the thumbnail does not exist, generate the thumbnail directly
resizeImg($picID."_0".$picTypes,$picWidth,$picWidth,$picID."_".$picWidth.$picTypes);
//Output
outputImg($picID."_".$picWidth.$picTypes);
}else
{
//If the large image does not exist
resizeImg('noDefaultImage.gif',$picWidth,$picWidth,noDefaultImage. "_".$picWidth.".gif");
//Output
outputImg($picID."_".$picWidth.$picTypes);
}
}
}
//Determine whether a large image exists in the file
if(file_exists($picID."_0".$picTypes))
{
$img_file = $picID."_0".$picTypes;
outputImg($img_file);
}
else
{
//if it does not exist Image
$img_file = 'noDefaultImage.gif';
outputImg($img_file);
}
}
//Output image
function outputImg($img_file)
{
$fp = fopen($img_file, 'rb');
$content = fread($fp, filesize($img_file)); //Binary data
fclose($fp);
header('Content-Type: image/gif');
echo $content;
}
/ **
* Generate thumbnails
* $srcName---- is the original image path
* $newWidth, $newHeight---- are the maximum width and height of the thumbnail respectively
* $newName---- is the thumbnail file name ( including path)
* @param string $srcName
* @param int $newWidth
* @param int $newHeight
* @param string $newName
* return viod
*/
function resizeImg($srcName,$newWidth,$newHeight,$newName="")
{
if($newName=="")
{
$nameArr=explode('.', $srcName);
$expName=array_pop($nameArr);
$expName=$expName;
array_push($nameArr,$expName);
$newName = implode('.',$nameArr);
}
$info = "";
$data = getimagesize($srcName,$info);
switch ($data[2])
{
case 1:
if(!function_exists("imagecreatefromgif")){
echo "Your GD The library cannot use images in GIF format, please use Jpeg or PNG format! return ";
exit();
}
$im = ImageCreateFromGIF($srcName);
break;
case 2:
if(!function_exists("imagecreatefromjpeg")){
echo "Your GD library cannot use jpeg format For pictures, please use pictures in other formats!返回";
exit();
}
$im = ImageCreateFromJpeg($srcName);
break;
case 3:
$im = ImageCreateFromPNG($srcName);
break;
}
$srcW=ImageSX($im);
$srcH=ImageSY($im);
$newWidthH=$newWidth/$newHeight;
$srcWH=$srcW/$srcH;
if($newWidthH<=$srcWH){
$ftoW=$newWidth;
$ftoH=$ftoW*($srcH/$srcW);
}
else{
$ftoH=$newHeight;
$ftoW=$ftoH*($srcW/$srcH);
}
if($srcW>$newWidth||$srcH>$newHeight)
{
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,$newName);
else ImagePNG($ni,$newName);
ImageDestroy($ni);
}
ImageDestroy($im);
}
?>