Url to images not working

for ($i=1; $i < 30; $i++) {
     	$image_number = sprintf('%02d', $i);

     	$file = 'https://carmanager.be/carimages/L/' . $car->license . '_' . $image_number . '.jpg';
		$file_headers = @get_headers($file);
		if($file_headers[0] == 'HTTP/1.1 404 Not Found') {
		    $exists = false;
		}
		else {
		    $exists = true;
		}

		print 'hier ' . $exists . ' ' . $file . '<br>';
     }

    
     ?>

What exactly isn’t working?

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