3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(): ?string { return ''; } function bar(): ?string { return null; } foo(); bar();
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.30, 8.2.0 - 8.2.25, 8.3.0 - 8.3.14
Output for 7.0.0 - 7.0.33
Parse error: syntax error, unexpected '?' in /in/DgH88 on line 3
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting '{' in /in/DgH88 on line 3
Process exited with code 255.
preferences:
82.06 ms | 408 KiB | 5 Q