方法一

function resize_img(path='./'){
path.uniqid().'.jpg';
url;
list(height) = getimagesize(percent = (110/newwidth = percent;
height * src_im = imagecreatefromjpeg(dst_im = imagecreatetruecolor(newheight);
imagecopyresized(src_im, 0, 0, 0, 0, newheight, height);
imagejpeg(imgname); //输出压缩后的图片
imagedestroy(src_im);
return $imgname;
}

function test(path='./'){
h=110; // original size
url;
path.uniqid().'.png';
original_path));
w,newpic,false);
newpic, 0, 0, 0, 127);
w/2;
for(x<x++)
for(y<y++){
src,y);
x - _y = h/2;
if(((_x) + (_y)) < (r)){
imagesetpixel(x,c);
}else{
imagesetpixel(x,transparent);
}
}
imagesavealpha(newpic, newpic);
imagedestroy(url);
return $dest_path;
}

方法二

circleAvatar = DIR . DIRECTORY_SEPARATOR . 'avatar.png';
$r = 50;

function getCircleAvatar(circleAvatar, size = 2 * circle = new Imagick();
size, circle->setimageformat('png');
$circle->setimagematte(true);

/**
 * @des     在矩形上画一个白色圆
 */
$draw = new ImagickDraw();
$draw->setfillcolor('#fff');
$draw->circle($r, $r, $r, $size);
$circle->drawimage($draw);

/**
 * @des     裁剪头像成圆形
 */
$imagick = new Imagick();
$imagick->readImage($avatar);
$imagick->setImageFormat('png');
$imagick->setimagematte(true);
$imagick->cropimage($size, $size, 30, 0); // 修改裁剪属性
$imagick->compositeimage($circle, Imagick::COMPOSITE_COPYOPACITY , 0, 0);
$imagick->writeImage($circleAvatar);
$imagick->destroy();

}

getCircleAvatar(circleAvatar, $r);