PHP实例:PHP批量生成缩略图_[PHP教程]
					 到今天我学PHP已经快一年了。不过小弟资质相当有限,一直没有做出什么好东西来。在工作中有时需要把大批量的图片变小,这是一件很简单但很无聊的事情。有一天突发奇想,怎么不用PHP来做一个小程序呢?于是昨天完成了一个批量生成缩略图的小程序。现在发布出来,请各位大哥大姐多多批评!
 1.先来分析一下程序的界面。
 界面很简单:首先声明本程序仅支持JPG、GIF、PNG三种图片格式。然后分别指出源文件和缩略图保存的文件夹。接下来可以设置JPG的质量和缩量图的大小。最后是显示所消耗的时间和处理的图片数。
 2.完整PHP源程序。源程序很简单,不多做解释。解压后直接放于可运行PHP的WWW目录下既可运行。
function microtimeFloat()
{
 list(uSecond, second) = explode(" ", microtime());
 return ((float)uSecond + (float)second);
}
dirFlag = pathinfo(_SERVER['scrīpt_FILENAME'],PATHINFO_DIRNAME);
timeStart = microtimeFloat();
sourcesDir = 'sources/';
thumbsDir = 'thumbs/';
jpgQuality = _POST['jpgQuality'];
thumbWidth = _POST['thumbWidth'];
counter = 0;
if(handle = opendir(sourcesDir)) {
 while(imageName = readdir(handle)) {
 FileExtName = strtolower(pathinfo(imageName, PATHINFO_EXTENSION));
 if((FileExtName == 'gif') or (FileExtName == 'jpg') or (FileExtName == 'jpeg') or (FileExtName == 'png')) {
 thumbsUrl = thumbsDir.imageName;
 list(realWidth, realHeight) = getimagesize(sourcesDir.imageName);
 if(realWidth < thumbWidth){
 percent = 1;
 } else {
 percent = thumbWidth / realWidth;
 }
 newWidth = realWidth * percent;
 newHeight = realHeight * percent;
 currentThumb = imagecreatetruecolor(newWidth, newHeight);
 list(width, height, pictureType, attrib) = getimagesize(sourcesDir.imageName);
 switch(pictureType)
 {
 case "1": source = imagecreatefromgif(sourcesDir.imageName); break;
 case "2": source = imagecreatefromjpeg(sourcesDir.imageName); break;
 case "3": source = imagecreatefrompng(sourcesDir.imageName); break;
 }
 imagecopyresized(currentThumb, source, 0, 0, 0, 0, newWidth, newHeight, realWidth, realHeight);
 switch(pictureType)
 {
 case "1": imagegif(currentThumb, thumbsUrl); break;
 case "2": imagejpeg(currentThumb, thumbsUrl, jpgQuality); break;
 case "3": imagepng(currentThumb, thumbsUrl); break;
 }
 counter++;
 }
 }
 closedir(handle);
 timeEnd = microtimeFloat();
 execTime = round(timeEnd - timeStart, 2);
}
?>
批量生成缩略图
来源:csdn