thumbs21.php

<?php
// array of thumbnail images
$thumbnails = array('1_a.jpg','2_b.jpg','3_c.jpg','4_d.jpg','5_e.jpg',
					'6_f.jpg','7_g.jpg','8_h.jpg','9_i.jpg','10_j.jpg');

// set thumbnail path
$thumb_dir = '../share/images/';

// set width and height of image output
$out_width = 0;
$out_height = 0;

// look for output width and height
foreach ($thumbnails as $thumbnail) {
	list($width, $height) = getimagesize($thumb_dir.$thumbnail);
	$out_width += $width;
	$out_height = ($height >= $out_height) ? $height : $out_height;
}

// set x-coordinate of destination point
$dst_x = 0;

// create new true color image
$out = imagecreatetruecolor($out_width, $out_height);

// copy thumbnail images to new image
foreach ($thumbnails as $thumbnail) {	
	
	$image = imagecreatefromjpeg($thumb_dir.$thumbnail);
	
	$x = imagesx($image);
	$y = imagesy($image);

	imagecopymerge($out, $image, $dst_x, 0, 0, 0, $x, $y, 100);
	imagedestroy($image);
	
	// move the next thumbnail
	$dst_x += $x;
}

// set the content type and render new image
header('Content-Type: image/jpeg');
imagejpeg($out);