3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(-1); $b['hi'] = 1; if(($a['hello'] ?? $b['hi'] ?? $c['hello']) === 1) { echo '2'; }
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
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/NQ38r on line 4
Process exited with code 255.
preferences:
200.92 ms | 402 KiB | 273 Q