Afbeeldingvergelijker

<?php
/**
 * This script is made under the GNU / GPL licence
 * The author's name _MUST_ stay intact
 *  
 * @author Jason de Ridder
 * @copyright Jason de Ridder
 * @param string $img1
 * @param string $img2
 * @param string $ttf The TrueType Font locationn
 */
function compare_images($img1, $img2, $ttf) {
	/* Create image */
	$img1_str = file_get_contents($img1);
	$img2_str = file_get_contents($img2);
	
	$img1_res = imagecreatefromstring($img1_str);
	$img2_res = imagecreatefromstring($img2_str);
	if($img1_str == $img2_str) {
		//return 100;
	}
	
	/* Image size */
	$img1_w = imagesx($img1_res);
	$img1_h = imagesy($img1_res);
	
	$img2_w = imagesx($img2_res);
	$img2_h = imagesy($img2_res);
	
	/* set new width / height */
	if($img1_w > $img2_w) {
		$new_width = $img1_w;
	}
	else {
		$new_width = $img2_w;
	}
	
	if($img1_h > $img2_h) {
		$new_height = $img1_h;
	}
	else {
		$new_height = $img2_h;
	}
	
	$tmp_img = imagecreatetruecolor($new_width, $new_height);
	
	imagecopyresampled($tmp_img, $img1_res, 0, 0, 0, 0, $new_width, $new_height, $img1_w, $img1_h);
	$img1_res = $tmp_img;
	
	unset($tmp_img);
	$tmp_img = imagecreatetruecolor($new_width, $new_height);
	
	imagecopyresampled($tmp_img, $img2_res, 0, 0, 0, 0, $new_width, $new_height, $img2_w, $img2_h);
	$img2_res = $tmp_img;
	
	// At this point the two images are same sizes
	// Now will come all the calculating
	$total_points = ($new_height * $new_width) / 2;
	$match_points = 0;
	for($i = 0; $i < ($new_width / 2); $i++) {
		for($j = 0; $j < $new_height; $j++) {
			$tmp_img = imagecreatetruecolor(2, 1);
			$tmp_img2 = imagecreatetruecolor(2, 1);
			imagecopyresampled($tmp_img, $img1_res, 0, 0, 2 * $i, $j, 2, 1, 2, 1);
			imagecopyresampled($tmp_img2, $img2_res, 0, 0, 2 * $i, $j, 2, 1, 2, 1);
			imagegif($tmp_img, 'tmpImg.gif');
			imagegif($tmp_img2, 'tmpImg2.gif');
			$str_tmp_img = file_get_contents('tmpImg.gif');
			$str_tmp_img2 = file_get_contents('tmpImg2.gif');
			if($str_tmp_img == $str_tmp_img2) {
				$match_points++;
			}
			unset($tmp_img);
			unset($tmp_img2);
			if(($i * $j) % 500 == 0) {
				sleep(0.5);
			}
		}
	}
	$percentage = floor((100 * $match_points) / $total_points) . '%';
	imagecopymerge($img1_res, $img2_res, 0, 0, 0, 0, $new_width, $new_height, 50);
	$red = imagecolorallocate($img1_res, 255, 0, 0);
	imagettftext($img1_res, 10, 0, 5, ($new_height / 2) - 12.5, $red, $ttf, 'Images matches for:');
	imagettftext($img1_res, 20, 0, 40, ($new_height / 2) + 12.5, $red, $ttf, $percentage);
	header('Content-type: image/png');
	imagepng($img1_res);
}

?>