3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = $_GET['x'] ?? '';
Output for 7.0.0, 7.0.3, 7.0.6 - 7.0.13, 7.0.15, 7.0.17, 7.0.21 - 7.0.24, 7.0.27 - 7.0.29, 7.0.32 - 7.0.33, 7.1.0, 7.1.2, 7.1.6, 7.1.9, 7.1.14 - 7.1.15, 7.1.20 - 7.1.33, 7.2.0 - 7.2.4, 7.2.8 - 7.2.26, 7.3.0 - 7.3.13, 7.4.0 - 7.4.1, 8.1.28, 8.2.16 - 8.2.19, 8.3.3 - 8.3.7
Output for 5.5.0, 5.5.2, 5.5.6, 5.5.8, 5.5.10, 5.5.19 - 5.5.20, 5.5.22, 5.6.5, 5.6.7 - 5.6.9, 5.6.11 - 5.6.14, 5.6.16, 5.6.25, 5.6.27, 5.6.29 - 5.6.34, 7.0.1 - 7.0.2, 7.0.4 - 7.0.5, 7.0.14, 7.0.16, 7.0.18 - 7.0.20, 7.0.25 - 7.0.26, 7.0.30 - 7.0.31, 7.1.1, 7.1.3 - 7.1.5, 7.1.7 - 7.1.8, 7.1.10 - 7.1.13, 7.1.16 - 7.1.19, 7.2.5 - 7.2.7

Process exited with code 137.
Output for 5.5.1, 5.5.3 - 5.5.5, 5.5.7, 5.5.9, 5.5.11 - 5.5.18, 5.5.21, 5.5.23 - 5.5.38, 5.6.0 - 5.6.4, 5.6.6, 5.6.10, 5.6.15, 5.6.17 - 5.6.24, 5.6.26, 5.6.28, 5.6.35 - 5.6.40
Parse error: syntax error, unexpected '?' in /in/QGkBo on line 3
Process exited with code 255.

preferences:
153.61 ms | 404 KiB | 206 Q