Create combine thumbnail from multiple images. Examples http://planet-green.com/archives/446

combine_thumb.php

<?php

/*
 * combine_thumb.php
 *
 * examples - http://planet-green.com/archives/446
 *
 * System Requirements:
 *  PHP v5.3+
 *  ImageMagick
 *
 * Copyright (c) 2017 tomoya kawabata.
 * http://planet-green.com/
 *
 * Released under the MIT license
 * (See copy at http://opensource.org/licenses/mit-license.php)
*/

class combine_thumb
{
	static function build_combine_thumb(Array $filePaths, $size_w, $size_h , $dest_jpg_path, $quality=70)
	{
		$img_dest = new Imagick();

		if ( !$img_dest )
		{
			throw new Exception("Can't create new image.");
		}

		$img_dest->newImage($size_w, $size_h, new ImagickPixel('rgb(200,200,200)'));

		$img_cnt = count($filePaths);

		switch($img_cnt)
		{
			case 1:
				$_size_w = $size_w;
				$_size_h = $size_h;
				break;

			case 2:
				$_size_w = $size_w;
				$_size_h = $size_h/2;
				break;

			case 3:
				$_size_w = $size_w / 3;
				$_size_h = $size_h;
				break;

			default:
			case 4:
				$_size_w = $size_w / 2;
				$_size_h = $size_h / 2;
				break;
		}

		$x = $y = 0;

		foreach ($filePaths as $file)
		{
			$img_tmp = new Imagick($file);

			if ( !$img_tmp )
			{
				throw new Exception("Can't open image file.");
			}

			$img_tmp->stripImage();
			$img_tmp->cropthumbnailimage( round($_size_w)+1, round($_size_h)+1);
			$img_dest->compositeImage( $img_tmp, imagick::COMPOSITE_DEFAULT, round($x), round($y) );
			$img_tmp->clear();

			$x += $_size_w;

			if( $x >= $size_w )
			{
				$x = 0;
				$y += $_size_h;
			}
		}

		$img_dest->setImageFormat('jpeg');
		$img_dest->setCompression(Imagick::COMPRESSION_JPEG);
		$img_dest->setImageCompressionQuality($quality);
		$img_dest->writeImage($dest_jpg_path);
		$img_dest->clear();

		return true;
	}
}

sample.php

<?php

require_once "combine_thumb.php";

$filePaths = array(
	"/path/to/src/image1.jpg",
	"/path/to/src/image2.jpg",
	"/path/to/src/image3.jpg",
	"/path/to/src/image4.jpg",
);

$dest_jpg_path = "/path/to/dest/output.jpg";

combine_thumb::build_combine_thumb($filePaths, 80, 80 , $dest_jpg_path, 70);