3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump( $a ?? $b );
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Warning: Undefined variable $b in /in/m0YnP on line 4 NULL
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: b in /in/m0YnP on line 4 NULL
Output for 7.3.32 - 7.3.33
NULL
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.21
Parse error: syntax error, unexpected '?' in /in/m0YnP on line 4
Process exited with code 255.

preferences:
171.56 ms | 401 KiB | 179 Q