PHP URL 404 loop

php-url-404-loop.php

<?php

// Loop through URL array and look for 404 results.
$url_array = ['https://facebook.com/','https://googlemaps.com/','https://gigglemips54252.com/', 'https://www.airbnb.com/'];

foreach ($url_array as $url_entry) {
  $file_headers = @get_headers($url_entry); 
  $exists = !$file_headers || $file_headers[0] == 'HTTP/1.1 404 Not Found' ? false : true;
  echo $exists;
}