缩略图生成
- WBOY原創
- 2016-06-07 11:45:071198瀏覽
自动生成缩略图，支持裁切。调用方法简单：thumb.php?url=/yovae/data/userface/000/00/00/41_middle_face.jpg?1247718988&w=20&h=20<?php <br />
/*<br>
* 自动缩略图 参数 url|w|h|type="cut/full"|mark="text/image|r"<br>
* thumb.php?url=/yovae/data/userface/000/00/00/41_middle_face.jpg?1247718988&w=20&h=20<br>
*/<br>
error_reporting(0);<br>
set_time_limit(30);<br>
$biggest_memory_limit = 256; //单位M，后缀不要加M<br>
//全局定义文件<br>
//require 'define.inc.php';<br>
<br>
//临时目录<br>
$tempDir = "./data/thumb_temp/";<br>
checkDir($tempDir);<br>
<br>
//分析URL<br>
$url = urldecode($_GET['url']);<br>
$url = preg_replace('/(.*)\?(.*)$/','$1',$url);<br>
<br>
//XSS脚本攻击探测<br>
//include THINK_PATH.'/Vendor/xss.php';<br>
//DetectXSS($url);<br>
<br>
//2009-10-7 修改 将本地图片修改成相对地址，避免file_get_contents不能读取远程文件时出错（可修改php.ini 设置 allow_fopen_url 为 true）<br>
//$url = str_ireplace(SITE_URL,'.',$url);<br>
if(file_exists($url)){<br>
$url = $url;<br>
}elseif($result = GrabImage($url,$tempDir)){<br>
$url = $result;<br>
$grab_temp_file = $result;<br>
}else{<br>
$url = "./Public/images/nopic.jpg";<br>
}<br>
<br>
//解析参数<br>
$w = $_GET['w']?intval($_GET['w']):'100'; //宽度<br>
$h = $_GET['h']?intval($_GET['h']):'100'; //高度<br>
$t = $_GET['t']=='f'?'f':'c'; //是否切割<br>
$r = $_GET['r']?1:0; //是否覆盖<br>
<br>
//目录名hash<br>
$fileHash = md5($url.$w.$h);<br>
$hashPath = substr($fileHash,0,2).'/'.substr($fileHash,2,2).'/';<br>
<br>
//缩图目录<br>
$thumbDir = "./data/thumb/".$hashPath;<br>
checkDir($thumbDir);<br>
<br>
if(!$sourceInfo['type']) <br>
$sourceInfo['type'] == 'jpg';<br>
<br>
$tempFile = $tempDir.$fileHash.'.'.$sourceInfo['type'];<br>
$thumbFile = $thumbDir.$fileHash."_".$w."_".$h."_".$t.'.'.$sourceInfo['type'];<br>
<br>
$img = new Image();<br>
//判断是否替换，存在则跳转，不存在继续进行<br>
if(!$r && file_exists($thumbFile)){<br>
//这里有2种方法，第一种多一次跳转，多一个http连接数，第二种，要进行一次php处理，多占用一部分内存。<br>
//header('location:'.$thumbFile);<br>
$img->showImg($thumbFile);<br>
}<br>
<br>
//不存在输出<br>
if(copy($url,$tempFile)){<br>
<br>
//判断图片大小 如果图片宽和高都小于要缩放的比例 直接输出<br>
$info = getimagesize($tempFile);<br>
//判断处理图片大约需要的内存<br>
$need_memory = (($info[0]*$info[1])/100000);<br>
$memory_limit = ini_get('memory_limit');<br>
if( ($need_memory > $memory_limit) && ($need_memory
ini_set('memory_limit',$need_memory.'M');<br>
}<br>
<br>
if($info[0]
copy($tempFile,$thumbFile);<br>
$img->showImg($thumbFile,'',$info[0],$info[1]);<br>
unlink($tempFile);<br>
unlink($grab_temp_file);<br>
exit;<br>
}else{<br>
//生成缩图<br>
if($t=='c'){<br>
$thumb = $img->cutThumb($tempFile,$thumbFile,$w,$h);<br>
}elseif($t=='f'){<br>
$thumb = $img->thumb($tempFile,'',$thumbFile,$w,$h);<br>
}<br>
//输出缩图<br>
$img->showImg($thumb,'',$w,$h);<br>
unlink($tempFile);<br>
unlink($grab_temp_file);<br>
exit;<br>
}<br>
}<br>
<br>
//获取远程图片<br>
function GrabImage($url,$thumbDir) {<br>
if($url=="") return false;<br>
$filename = md5($url).strrchr($url,".");<br>
$img = file_get_contents($url);<br>
if(!$img) return false;<br>
<br>
$filepath = $thumbDir.$filename;<br>
$result = file_put_contents($filepath,$img);<br>
if($result){<br>
return $filepath;<br>
}else{<br>
return false;<br>
}<br>
}<br>
<br>
//检查并创建多级目录<br>
function checkDir($path){<br>
$pathArray = explode('/',$path);<br>
$nowPath = '';<br>
array_pop($pathArray);<br>
foreach ($pathArray as $key=>$value){<br>
if ( ''==$value ){<br>
unset($pathArray[$key]);<br>
}else{<br>
if ( $key == 0 )<br>
$nowPath .= $value;<br>
else<br>
$nowPath .= '/'.$value;<br>
if ( !is_dir($nowPath) ){<br>
if ( !mkdir($nowPath, 0777) ) return false;<br>
}<br>
}<br>
}<br>
return true;<br>
}<br>
<br>
function imagecreatefrombmp($fname) {<br>
<br>
$buf=@file_get_contents($fname);<br>
<br>
if(strlen($buf)
<br>
$file_header=unpack("sbfType/LbfSize/sbfReserved1/sbfReserved2/LbfOffBits",substr($buf,0,14));<br>
<br>
if($file_header["bfType"]!=19778) return false;<br>
$info_header=unpack("LbiSize/lbiWidth/lbiHeight/sbiPlanes/sbiBitCountLbiCompression/LbiSizeImage/lbiXPelsPerMeter/lbiYPelsPerMeter/LbiClrUsed/LbiClrImportant",substr($buf,14,40));<br>
if($info_header["biBitCountLbiCompression"]==2) return false;<br>
$line_len=round($info_header["biWidth"]*$info_header["biBitCountLbiCompression"]/8);<br>
$x=$line_len%4;<br>
if($x>0) $line_len+=4-$x;<br>
<br>
$img=imagecreatetruecolor($info_header["biWidth"],$info_header["biHeight"]);<br>
switch($info_header["biBitCountLbiCompression"]){<br>
case 4:<br>
$colorset=unpack("L*",substr($buf,54,64));<br>
for($y=0;$y
$colors=array();<br>
$y_pos=$y*$line_len+$file_header["bfOffBits"];<br>
for($x=0;$x
if($x%2)<br>
$colors[]=$colorset[(ord($buf[$y_pos+($x+1)/2])&0xf)+1];<br>
else<br>
$colors[]=$colorset[((ord($buf[$y_pos+$x/2+1])>>4)&0xf)+1];<br>
}<br>
imagesetstyle($img,$colors);<br>
imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED);<br>
}<br>
break;<br>
case 8:<br>
$colorset=unpack("L*",substr($buf,54,1024));<br>
for($y=0;$y
$colors=array();<br>
$y_pos=$y*$line_len+$file_header["bfOffBits"];<br>
for($x=0;$x
$colors[]=$colorset[ord($buf[$y_pos+$x])+1];<br>
}<br>
imagesetstyle($img,$colors);<br>
imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED);<br>
}<br>
break;<br>
case 16:<br>
for($y=0;$y
$colors=array();<br>
$y_pos=$y*$line_len+$file_header["bfOffBits"];<br>
for($x=0;$x
$i=$x*2;<br>
$color=ord($buf[$y_pos+$i])|(ord($buf[$y_pos+$i+1])
$colors[]=imagecolorallocate($img,(($color>>10)&0x1f)*0xff/0x1f,(($color>>5)&0x1f)*0xff/0x1f,($color&0x1f)*0xff/0x1f);<br>
}<br>
imagesetstyle($img,$colors);<br>
imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED);<br>
}<br>
break;<br>
case 24:<br>
for($y=0;$y
$colors=array();<br>
$y_pos=$y*$line_len+$file_header["bfOffBits"];<br>
for($x=0;$x
$i=$x*3;<br>
$colors[]=imagecolorallocate($img,ord($buf[$y_pos+$i+2]),ord($buf[$y_pos+$i+1]),ord($buf[$y_pos+$i]));<br>
}<br>
imagesetstyle($img,$colors);<br>
imageline($img,0,$info_header["biHeight"]-$y-1,$info_header["biWidth"],$info_header["biHeight"]-$y-1,IMG_COLOR_STYLED);<br>
}<br>
break;<br>
default:<br>
return false;<br>
break;<br>
}<br>
return $img;<br>
}<br>
function imagebmp(&$im, $filename = '', $bit = 8, $compression = 0)<br>
{<br>
if (!in_array($bit, array(1, 4, 8, 16, 24, 32)))<br>
{<br>
$bit = 8;<br>
<br>
}<br>
else if ($bit == 32) // todo:32 bit<br>
{<br>
$bit = 24;<br>
}<br>
<br>
$bits = pow(2, $bit);<br>
<br>
// 调整调色板<br>
imagetruecolortopalette($im, true, $bits);<br>
$width = imagesx($im);<br>
$height = imagesy($im);<br>
$colors_num = imagecolorstotal($im);<br>
<br>
if ($bit
{<br>
// 颜色索引<br>
$rgb_quad = '';<br>
for ($i = 0; $i
{<br>
$colors = imagecolorsforindex($im, $i);<br>
$rgb_quad .= chr($colors['blue']) . chr($colors['green']) . chr($colors['red']) . "\0"; }<br>
<br>
// 位图数据<br>
$bmp_data = '';<br>
<br>
// 非压缩<br>
if ($compression == 0 || $bit
{<br>
if (!in_array($bit, array(1, 4, 8)))<br>
{<br>
$bit = 8;<br>
}<br>
<br>
$compression = 0;<br>
<br>
// 每行字节数必须为4的倍数，补齐。<br>
<br>
<br>
$extra = '';<br>
$padding = 4 - ceil($width / (8 / $bit)) % 4;<br>
if ($padding % 4 != 0)<br>
{<br>
$extra = str_repeat("\0", $padding);<br>
}<br>
<br>
for ($j = $height - 1; $j >= 0; $j --)<br>
{<br>
$i = 0;<br>
while ($i
{<br>
$bin = 0;<br>
$limit = $width - $i
<br>
for ($k = 8 - $bit; $k >= $limit; $k -= $bit)<br>
{<br>
$index = imagecolorat($im, $i, $j);<br>
$bin |= $index
$i ++;<br>
}<br>
<br>
$bmp_data .= chr($bin);<br>
}<br>
<br>
$bmp_data .= $extra;<br>
}<br>
}<br>
// RLE8 压缩<br>
else if ($compression == 1 && $bit == 8)<br>
{<br>
for ($j = $height - 1; $j >= 0; $j --)<br>
{<br>
$last_index = "\0";<br>
$same_num = 0;<br>
for ($i = 0; $i
{<br>
$index = imagecolorat($im, $i, $j);<br>
if ($index !== $last_index || $same_num > 255)<br>
{<br>
if ($same_num != 0)<br>
{<br>
$bmp_data .= chr($same_num) . chr($last_index);<br>
}<br>
<br>
$last_index = $index;<br>
$same_num = 1;<br>
}<br>
else<br>
{<br>
$same_num ++;<br>
}<br>
}<br>
<br>
$bmp_data .= "\0\0";<br>
}<br>
<br>
$bmp_data .= "\0\1";<br>
}<br>
<br>
$size_quad = strlen($rgb_quad);<br>
$size_data = strlen($bmp_data);<br>
}<br>
else<br>
{<br>
// 每行字节数必须为4的倍数，补齐。<br>
$extra = '';<br>
$padding = 4 - ($width * ($bit / 8)) % 4;<br>
if ($padding % 4 != 0)<br>
{<br>
$extra = str_repeat("\0", $padding);<br>
}<br>
<br>
// 位图数据<br>
$bmp_data = '';<br>
<br>
for ($j = $height - 1; $j >= 0; $j --)<br>
{<br>
for ($i = 0; $i
{<br>
$index = imagecolorat($im, $i, $j);<br>
$colors = imagecolorsforindex($im, $index);<br>
<br>
if ($bit == 16)<br>
{<br>
$bin = 0
<br>
$bin |= ($colors['red'] >> 3)
$bin |= ($colors['green'] >> 3)
$bin |= $colors['blue'] >> 3;<br>
<br>
$bmp_data .= pack("v", $bin);<br>
}<br>
else<br>
{<br>
$bmp_data .= pack("c*", $colors['blue'], $colors['green'], $colors['red']);<br>
}<br>
<br>
// todo: 32bit;<br>
}<br>
<br>
$bmp_data .= $extra;<br>
}<br>
<br>
$size_quad = 0;<br>
$size_data = strlen($bmp_data);<br>
$colors_num = 0;<br>
}<br>
<br>
// 位图文件头<br>
$file_header = "BM" . pack("V3", 54 + $size_quad + $size_data, 0, 54 + $size_quad);<br>
<br>
// 位图信息头<br>
$info_header = pack("V3v2V*", 0x28, $width, $height, 1, $bit, $compression, $size_data, 0, 0, $colors_num, 0);<br>
// 写入文件<br>
if ($filename != '')<br>
{<br>
$fp = fopen("test.bmp", "wb");<br>
<br>
fwrite($fp, $file_header);<br>
fwrite($fp, $info_header);<br>
fwrite($fp, $rgb_quad);<br>
fwrite($fp, $bmp_data);<br>
fclose($fp);<br>
<br>
return 1;<br>
}<br>
<br>
// 浏览器输出<br>
header("Content-Type: image/bmp");<br>
echo $file_header . $info_header;<br>
echo $rgb_quad;<br>
echo $bmp_data;<br>
<br>
return 1;<br>
}<br>
class Image<br>
{//类定义开始<br>
<br>
/**<br>
+----------------------------------------------------------<br>
* 架构函数<br>
*<br>
+----------------------------------------------------------<br>
* @access public<br>
+----------------------------------------------------------<br>
*/<br>
function __construct()<br>
{<br>
<br>
}<br>
<br>
/**<br>
+----------------------------------------------------------<br>
* 取得图像信息<br>
*<br>
+----------------------------------------------------------<br>
* @static<br>
* @access public<br>
+----------------------------------------------------------<br>
* @param string $image 图像文件名<br>
+----------------------------------------------------------<br>
* @return mixed<br>
+----------------------------------------------------------<br>
*/<br>
function getImageInfo($img) {<br>
$imageInfo = getimagesize($img);<br>
if( $imageInfo!== false) {<br>
<br>
if(function_exists(image_type_to_extension)){<br>
$imageType = strtolower(substr(image_type_to_extension($imageInfo[2]),1));<br>
}else{<br>
$imageType = strtolower(substr($img,strrpos($img,'.')+1));<br>
}<br>
<br>
$imageSize = filesize($img);<br>
$info = array(<br>
"width"=>$imageInfo[0],<br>
"height"=>$imageInfo[1],<br>
"type"=>$imageType,<br>
"size"=>$imageSize,<br>
"mime"=>$imageInfo['mime']<br>
);<br>
return $info;<br>
}else {<br>
return false;<br>
}<br>
}<br>
<br>
/**<br>
+----------------------------------------------------------<br>
* 显示服务器图像文件<br>
* 支持URL方式<br>
+----------------------------------------------------------<br>
* @static<br>
* @access public<br>
+----------------------------------------------------------<br>
* @param string $imgFile 图像文件名<br>
* @param string $text 文字字符串<br>
* @param string $width 图像宽度<br>
* @param string $height 图像高度<br>
+----------------------------------------------------------<br>
* @return void<br>
+----------------------------------------------------------<br>
*/<br>
function showImg($imgFile,$text='',$width=80,$height=30) {<br>
//获取图像文件信息<br>
//2007/6/26 增加图片水印输出，$text为图片的完整路径即可<br>
$info = Image::getImageInfo($imgFile);<br>
if($info !== false) {<br>
$createFun = str_replace('/','createfrom',$info['mime']);<br>
$im = $createFun($imgFile);<br>
if($im) {<br>
$ImageFun= str_replace('/','',$info['mime']);<br>
//水印开始<br>
if(!empty($text)) {<br>
$tc = imagecolorallocate($im, 0, 0, 0);<br>
if(is_file($text)&&file_exists($text)){<br>
// 取得水印信息<br>
$textInfo = Image::getImageInfo($text);<br>
$createFun2= str_replace('/','createfrom',$textInfo['mime']);<br>
$waterMark = $createFun2($text);<br>
$imgW = $info["width"];<br>
$imgH = $info["width"]*$textInfo["height"]/$textInfo["width"];<br>
$y = ($info["height"]-$textInfo["height"])/2;<br>
if(function_exists("ImageCopyResampled"))<br>
ImageCopyResampled($im,$waterMark,0,$y,0,0, $imgW,$imgH, $textInfo["width"],$textInfo["height"]);<br>
else<br>
ImageCopyResized($im,$waterMark,0,$y,0,0,$imgW,$imgH, $textInfo["width"],$textInfo["height"]);<br>
}else{<br>
imagestring($im, 3, 5, 5, $text, $tc);<br>
}<br>
//ImageDestroy($tc);<br>
}<br>
//水印结束<br>
if($info['type']=='png' || $info['type']=='gif') {<br>
imagealphablending($im, FALSE);//取消默认的混色模式<br>
imagesavealpha($im,TRUE);//设定保存完整的 alpha 通道信息<br>
}<br>
Header("Content-type: ".$info['mime']);<br>
$ImageFun($im);<br>
@ImageDestroy($im);<br>
return ;<br>
}<br>
}<br>
//获取或者创建图像文件失败则生成空白PNG图片<br>
$im = imagecreatetruecolor($width, $height);<br>
$bgc = imagecolorallocate($im, 255, 255, 255);<br>
$tc = imagecolorallocate($im, 0, 0, 0);<br>
imagefilledrectangle($im, 0, 0, 150, 30, $bgc);<br>
imagestring($im, 4, 5, 5, "no pic", $tc);<br>
Image::output($im);<br>
return ;<br>
}<br>
<br>
// 切割缩图cutThumb<br>
// 2007/6/15<br>
function cutThumb($image,$filename='',$maxWidth='200',$maxHeight='50',$warterMark='',$type='',$interlace=true,$suffix='_thumb')<br>
{<br>
// 获取原图信息<br>
$info = Image::getImageInfo($image);<br>
if($info !== false) {<br>
$srcWidth = $info['width'];<br>
$srcHeight = $info['height'];<br>
$pathinfo = pathinfo($image);<br>
$type = $pathinfo['extension'];<br>
$type = empty($type)?$info['type']:$type;<br>
$type = strtolower($type);<br>
$interlace = $interlace? 1:0;<br>
unset($info);<br>
// 载入原图<br>
$createFun = 'ImageCreateFrom'.($type=='jpg'?'jpeg':$type);<br>
$srcImg = $createFun($image);<br>
<br>
//创建缩略图<br>
if($type!='gif' && function_exists('imagecreatetruecolor'))<br>
$thumbImg = imagecreatetruecolor($maxWidth, $maxHeight);<br>
else<br>
$thumbImg = imagecreate($maxWidth, $maxHeight);<br>
<br>
// 新建PNG缩略图通道透明处理<br>
if('png'==$type) {<br>
imagealphablending($thumbImg, false);//取消默认的混色模式<br>
imagesavealpha($thumbImg,true);//设定保存完整的 alpha 通道信息<br>
}elseif('gif'==$type) {<br>
// 新建GIF缩略图预处理，保证透明效果不失效<br>
$background_color = imagecolorallocate($thumbImg, 0,255,0); // 指派一个绿色<br>
imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图<br>
}<br>
<br>
// 计算缩放比例<br>
if(($maxWidth/$maxHeight)>=($srcWidth/$srcHeight)){<br>
//宽不变,截高，从中间截取 y=<br>
$width = $srcWidth;<br>
$height = $srcWidth*($maxHeight/$maxWidth);<br>
$x = 0;<br>
$y = ($srcHeight-$height)*0.5;<br>
}else{<br>
//高不变,截宽，从中间截取，x=<br>
$width = $srcHeight*($maxWidth/$maxHeight);<br>
$height = $srcHeight;<br>
$x = ($srcWidth-$width)*0.5;<br>
$y = 0;<br>
}<br>
// 复制图片<br>
if(function_exists("ImageCopyResampled")){<br>
ImageCopyResampled($thumbImg, $srcImg, 0, 0, $x, $y, $maxWidth, $maxHeight, $width,$height);<br>
}else{<br>
ImageCopyResized($thumbImg, $srcImg, 0, 0, $x, $y, $maxWidth, $maxHeight, $width,$height);<br>
}<br>
ImageDestroy($srcImg);<br>
/*水印开始* /<br>
if($warterMark){<br>
//计算水印的位置,默认居中<br>
$textInfo = Image::getImageInfo($warterMark);<br>
$textW = $textInfo["width"];<br>
$textH = $textInfo["height"];<br>
unset($textInfo);<br>
$mark = imagecreatefrompng($warterMark);<br>
$imgW = $width;<br>
$imgH = $width*$textH/$textW;<br>
$y = ($height-$textH)/2;<br>
if(function_exists("ImageCopyResampled")){<br>
ImageCopyResampled($thumbImg,$mark,0,$y,0,0, $imgW,$imgH, $textW,$textH);<br>
}else{<br>
ImageCopyResized($thumbImg,$mark,0,$y,0,0,$imgW,$imgH, $textW,$textH);<br>
}<br>
ImageDestroy($mark);<br>
}<br>
/*水印结束*/<br>
/*if('gif'==$type || 'png'==$type) {<br>
//imagealphablending($thumbImg, FALSE);//取消默认的混色模式<br>
//imagesavealpha($thumbImg,TRUE);//设定保存完整的 alpha 通道信息<br>
$background_color = ImageColorAllocate($thumbImg, 0,255,0);<br>
// 指派一个绿色<br>
imagecolortransparent($thumbImg,$background_color);<br>
// 设置为透明色，若注释掉该行则输出绿色的图<br>
}*/<br>
<br>
// 对jpeg图形设置隔行扫描<br>
if('jpg'==$type || 'jpeg'==$type) imageinterlace($thumbImg,$interlace);<br>
<br>
// 生成图片<br>
//$imageFun = 'image'.($type=='jpg'?'jpeg':$type);<br>
$imageFun = 'imagepng';<br>
$filename = empty($filename)? substr($image,0,strrpos($image, '.')).$suffix.'.'.$type : $filename;<br>
<br>
$imageFun($thumbImg,$filename);<br>
ImageDestroy($thumbImg);<br>
return $filename;<br>
}<br>
return false;<br>
<br>
}<br>
/**<br>
+----------------------------------------------------------<br>
* 生成缩略图<br>
*<br>
+----------------------------------------------------------<br>
* @static<br>
* @access public<br>
+----------------------------------------------------------<br>
* @param string $image 原图<br>
* @param string $type 图像格式<br>
* @param string $filename 缩略图文件名<br>
* @param string $maxWidth 宽度<br>
* @param string $maxHeight 高度<br>
* @param string $position 缩略图保存目录<br>
* @param boolean $interlace 启用隔行扫描<br>
+----------------------------------------------------------<br>
* @return void<br>
+----------------------------------------------------------<br>
* @throws ThinkExecption<br>
+----------------------------------------------------------<br>
*/<br>
//2007/7/18 添加水印缩略图<br>
function thumb($image,$type='',$filename='',$maxWidth=200,$maxHeight=50,$warterMark='',$interlace=true,$suffix='_thumb')<br>
{<br>
// 获取原图信息<br>
$info = Image::getImageInfo($image);<br>
if($info !== false) {<br>
$srcWidth = $info['width'];<br>
$srcHeight = $info['height'];<br>
$pathinfo = pathinfo($image);<br>
$type = $pathinfo['extension'];<br>
$type = empty($type)?$info['type']:$type;<br>
$type = strtolower($type);<br>
$interlace = $interlace? 1:0;<br>
unset($info);<br>
$scale = min($maxWidth/$srcWidth, $maxHeight/$srcHeight); // 计算缩放比例<br>
// 缩略图尺寸<br>
$width = (int)($srcWidth*$scale);<br>
$height = (int)($srcHeight*$scale);<br>
// 载入原图<br>
$createFun = 'ImageCreateFrom'.($type=='jpg'?'jpeg':$type);<br>
$srcImg = $createFun($image);<br>
//创建缩略图<br>
if($type!='gif' && function_exists('imagecreatetruecolor'))<br>
$thumbImg = imagecreatetruecolor($width, $height);<br>
else<br>
$thumbImg = imagecreate($width, $height);<br>
<br>
// 新建PNG缩略图通道透明处理<br>
if('png'==$type) {<br>
imagealphablending($thumbImg, false);//取消默认的混色模式<br>
imagesavealpha($thumbImg,true);//设定保存完整的 alpha 通道信息<br>
}elseif('gif'==$type) {<br>
// 新建GIF缩略图预处理，保证透明效果不失效<br>
$background_color = imagecolorallocate($thumbImg, 0,255,0); // 指派一个绿色<br>
imagecolortransparent($thumbImg,$background_color); // 设置为透明色，若注释掉该行则输出绿色的图<br>
}<br>
<br>
// 复制图片<br>
if(function_exists("ImageCopyResampled"))<br>
ImageCopyResampled($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth,$srcHeight);<br>
else<br>
ImageCopyResized($thumbImg, $srcImg, 0, 0, 0, 0, $width, $height, $srcWidth,$srcHeight);<br>
ImageDestroy($srcImg);<br>
/*<br>
//水印开始<br>
//计算水印的位置,默认居中<br>
$textInfo = Image::getImageInfo($warterMark);<br>
$textW = $textInfo["width"];<br>
$textH = $textInfo["height"];<br>
unset($textInfo);<br>
$mark = imagecreatefrompng($warterMark);<br>
$imgW = $width;<br>
$imgH = $width*$textH/$textW;<br>
$y = ($height-$textH)/2;<br>
if(function_exists("ImageCopyResampled")){<br>
ImageCopyResampled($thumbImg,$mark,0,$y,0,0, $imgW,$imgH, $textW,$textH);<br>
}else{<br>
ImageCopyResized($thumbImg,$mark,0,$y,0,0,$imgW,$imgH, $textW,$textH);<br>
}<br>
ImageDestroy($mark);<br>
//水印结束<br>
*/<br>
/*if('gif'==$type || 'png'==$type) {<br>
imagealphablending($thumbImg, FALSE);//取消默认的混色模式<br>
imagesavealpha($thumbImg,TRUE);//设定保存完整的 alpha 通道信息<br>
$background_color = ImageColorAllocate($thumbImg, 0,255,0);// 指派一个绿色<br>
imagecolortransparent($thumbImg,$background_color);// 设置为透明色，若注释掉该行则输出绿色的图<br>
}*/<br>
if('jpg'==$type || 'jpeg'==$type) {<br>
imageinterlace($thumbImg,$interlace);// 对jpeg图形设置隔行扫描<br>
}<br>
//&nbs