3v4l.org

run code in 300+ PHP versions simultaneously
<?php $input = fopen("http://www.white-bullet.com/domain-data.txt", "r"); $output = fopen("php://stdout", "w+"); if ($input) { while (($line = fgets($input))) { fwrite( $output, substr($line, 0, strpos($line, " "))); fwrite($output, "\n"); } fclose($input); fclose($output); } ?>

preferences:
38.52 ms | 402 KiB | 5 Q