3v4l.org

run code in 300+ PHP versions simultaneously
<?php $fp = fsockopen("udp://127.0.0.1", 13, $errno, $errstr); if (!$fp) { echo "ERROR: $errno - $errstr<br />\n"; } else { fwrite($fp, "\n"); echo fread($fp, 26); fclose($fp); }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Warning: fsockopen(): Unable to connect to udp://127.0.0.1:13 (Unknown error) in /in/eCKaf on line 3 ERROR: 0 - <br />
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Warning: fsockopen(): unable to connect to udp://127.0.0.1:13 (Unknown error) in /in/eCKaf on line 3 ERROR: 0 - <br />
preferences:
269.2 ms | 404 KiB | 415 Q