How to accept image extension from url in php?

Accept image extension from url in php

<?php

 $file_name = 'http://localhost/brrrr/wp-content/uploads/2019/11/New-Business-card-4.jpg';

echo $file_name."<br>";

$allowed = array('gif', 'png', 'jpg');

$ext = pathinfo($file_name, PATHINFO_EXTENSION);

if (!in_array($ext, $allowed)) {

    echo 'error';

}

else{

echo "this is ok";

}

 

?>