PHP Crop Image From Square to Circle aka Set Image Border Radius

Requirements

ImageMagick – ready-to-run binary distribution or as source code to create, edit, compose, or convert digital images (Website)

• Use sudo apt install on Ubuntu
• Use sudo yum install on CentOS

Intervention Image – PHP image handling and manipulation library (Website)

• composer require intervention/image

<?php

require './vendor/autoload.php';

use Intervention\Image\ImageManagerStatic as Image;

$img = Image::make('source-image.jpg');

$image_width = 300;

// Apply a smart crop 
$img->fit($image_width);

// create empty canvas with transparent background
$canvas = Image::canvas($image_width, $image_width);

// draw a black circle on it
$canvas->circle($image_width, $image_width/2, $image_width/2, function ($draw) {
 $draw->background('#000000');
});

// Mask your image with the shape
$img->mask($canvas->encode('png', 75), true); // 75 is the image compression ratio

// Response with the image or you can as well do whatever you like with it.
echo $img->response('png');

Sample Images

Source Image

Source Image (e.g. 400*400 Image In JPG)

Result Image

Result Image: 300*300 Rounded Corner Image In PNG

Additional Comments

It seems that the edge of the rounded corner image (300*300 Rounded Corner Image In PNG) is not that perfect (compared to what the Browser CSS border-radius can do), it contains some zigzag shape on the border outline. We can only resize it to a smaller size to make it look less obvious.

$resized_width = $image_width * 0.6;

$resized_img = Image::make($img->response('png')); 
$resized_img->resize($resized_width, $resized_width);
echo $resized_img->response('png');

Resized Image: 180*180 Rounded Corner Image In PNG