How to compare two images with PHP?

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Is there any tool or way to create an image comparison with PHP? I need the system to identify when one image is not the same as another.

php

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Image comparison in php is used with the library imagemagik as follows

<?php

$image1 = new imagick("image1.png");
$image2 = new imagick("image2.png");

$result = $image1->compareImages($image2, Imagick::METRIC_MEANSQUAREERROR);
$result[0]->setImageFormat("png");

header("Content-Type: image/png");
echo $result[0];

?>

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