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<?php

defined('UPLOAD_PATH') || define('UPLOAD_PATH', 'path_to_wp-content_uploads');
$url = 'image_URL'; //Image url like http://www.site.com/wp-content/uploads/year/month/image.jpg
				
$parts = array_slice(explode('/', $url), -3);
$imagePath = UPLOAD_PATH . implode(DIRECTORY_SEPARATOR, $parts);

if(file_exists($imagePath))
{
    $info = getimagesize($imagePath);
    echo '<pre style="background-color: #FFF; color:#000">';
    var_dump($info);
    echo '</pre>';
}
die();
?>