3v4l.org

run code in 300+ PHP versions simultaneously
<?php function foo(callable $arg) : callable { return $arg; } function bar() : callable { return 'hello'; } bar('hello')(); 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: bar(): Return value must be of type callable, string returned in /in/KTasL:8 Stack trace: #0 /in/KTasL(11): bar('hello') #1 {main} thrown in /in/KTasL on line 8
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Fatal error: Uncaught TypeError: Return value of bar() must be callable, string returned in /in/KTasL:8 Stack trace: #0 /in/KTasL(11): bar('hello') #1 {main} thrown in /in/KTasL on line 8
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/KTasL on line 3
Process exited with code 255.
preferences:
211.48 ms | 402 KiB | 242 Q