3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(callable $arg) : callable { return $arg; } foo('hello')();
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught TypeError: foo(): Argument #1 ($arg) must be of type callable, string given, called in /in/S4N2c on line 7 and defined in /in/S4N2c:3 Stack trace: #0 /in/S4N2c(7): foo('hello') #1 {main} thrown in /in/S4N2c on line 3
Process exited with code 255.
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
Fatal error: Uncaught TypeError: Argument 1 passed to foo() must be callable, string given, called in /in/S4N2c on line 7 and defined in /in/S4N2c:3 Stack trace: #0 /in/S4N2c(7): foo('hello') #1 {main} thrown in /in/S4N2c on line 3
Process exited with code 255.
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 ':', expecting '{' in /in/S4N2c on line 3
Process exited with code 255.

preferences:
239.63 ms | 402 KiB | 272 Q