3v4l.org

run code in 300+ PHP versions simultaneously
<?php $b = 16; echo $a ?? 2; echo "/n"; echo $a ?? $b ?? 7;
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
2/n16
Output for 5.4.1 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/rnqZp on line 5
Process exited with code 255.

preferences:
197.33 ms | 402 KiB | 257 Q