thinkphp对上传图像的处理

//hinkphp中的图像或资源文件，必须放在与项目名(例Application)同级的Public目录下。

//略缩图
$img->open("./Public/21770.jpg");

IMAGE_THUMB_SCALE = 1 ; //等比例缩放类型
IMAGE_THUMB_FILLED = 2 ; //缩放后填充类型
IMAGE_THUMB_CENTER = 3 ; //居中裁剪类型
IMAGE_THUMB_NORTHWEST = 4 ; //左上角裁剪类型
IMAGE_THUMB_SOUTHEAST = 5 ; //右下角裁剪类型
IMAGE_THUMB_FIXED = 6 ; //固定尺寸缩放类型

$img->thumb(300,300)->save(‘./Public/thumb.jpg‘);
$img->thumb(300,300,Image::IMAGE_THUMB_CENTER)->save(‘./Public/thumb.jpg‘);
//或者直接传参数3也可以实现居中裁剪,即
$img->thumb(300,300,3)->save(‘./Public/thumb.jpg‘);

/*******************************************************************************************/
//为打开的图片的右上角添加水印logo.jpg

//水印图
$img->water("./Public/logo.jpg",Image::IMAGE_WATER_NORTHWEST)->save("./Public/water1.jpg");
IMAGE_WATER_NORTHWEST = 1 ; //左上角水印
IMAGE_WATER_NORTH = 2 ; //上居中水印
IMAGE_WATER_NORTHEAST = 3 ; //右上角水印
IMAGE_WATER_WEST = 4 ; //左居中水印
.IMAGE_WATER_CENTER = 5 ; //居中水印
IMAGE_WATER_EAST = 6 ; //右居中水印
IMAGE_WATER_SOUTHWEST = 7 ; //左下角水印
IMAGE_WATER_SOUTH = 8 ; //下居中水印
IMAGE_WATER_SOUTHEAST = 9 ; //右下角水印
//添加文字水印，指定字体，和字体大小和字体颜色和水印位置
$img->text("GVIOP","./Public/calibri.ttf",80,"#ffffff",Image::IMAGE_WATER_SOUTHEAST)->save("./Public/water2.jpg");