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php生成缩略图代码
•php图像处理•阅读 257 - <?php
- /**
- * 生成缩略图
- * $srcName----为原图片路径
- * $newWidth，$newHeight----分别缩略图的最大宽，高
- * $newName----为缩略图文件名（含路径），默认为加入thumbnail
- * @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);
- $expName='thumbnail.'.$expName;
- array_push($nameArr,$expName);
- $newName = implode('.',$nameArr);
- }
- $info = "";
- $data = getimagesize($srcName,$info);
- switch ($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！返回";
- exit();
- }
- $im = ImageCreateFromGIF($srcName);
- 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！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);
- }
- //开源代码phpfensi.com
- resizeImg('123.JPG',150,150);
- ?>