//参数1 文件名 参数2 缩放比例
function _thumb($_filename,$_percent){
ob_clean();
//生成png标头文件
header('Content-type:image/png');
$_n=explode('.', $_filename);
//获取文件的信息,宽和高
list($_width,$_height)=getimagesize($_filename);
//生成缩略后的大小
$_new_width=$_width*$_percent;
$_new_height=$_height*$_percent;
//按照新的大小创建微缩画布
$_new_image=imagecreatetruecolor($_new_width, $_new_height);
//按照已经有的图片创建一个画布[按照图片类型]
switch($_n[1]){
case 'jpg':$_image=imagecreatefromjpeg($_filename);
break;
case 'png':$_image=imagecreatefrompng($_filename);
break;
case 'gif':$_image=imagecreatefromgif($_filename);
break;
}
//将原来的图复制到新的图片上
imagecopyresampled($_new_image, $_image, 0, 0, 0, 0, $_new_width, $_new_height, $_width, $_height);
//输出图片
imagepng($_new_image);
//销毁新资源句柄
imagedestroy($_new_image);
//销毁原资源句柄
imagedestroy($_image);
}
