Online PHP editor | output for cZtbI

Output for 8.5.0: Warning: Cannot bind method Bar::test() to object of class Foo, this will be an error in PHP 9 in /in/cZtbI on line 13 Fatal error: Uncaught Error: Value of type null is not callable in /in/cZtbI:14 Stack trace: #0 {main} thrown in /in/cZtbI on line 14
Process exited with code 255.
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14: Warning: Cannot bind method Bar::test() to object of class Foo in /in/cZtbI on line 13 Fatal error: Uncaught Error: Value of type null is not callable in /in/cZtbI:14 Stack trace: #0 {main} thrown in /in/cZtbI on line 14
Process exited with code 255.
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Warning: Cannot bind method Bar::test() to object of class Foo in /in/cZtbI on line 13 Fatal error: Uncaught Error: Function name must be a string in /in/cZtbI:14 Stack trace: #0 {main} thrown in /in/cZtbI on line 14
Process exited with code 255.
Output for 7.0.0 - 7.0.20: Warning: Cannot rebind scope of closure created by ReflectionFunctionAbstract::getClosure() in /in/cZtbI on line 13 Fatal error: Uncaught Error: Function name must be a string in /in/cZtbI:14 Stack trace: #0 {main} thrown in /in/cZtbI on line 14
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28: object(Foo)#1 (1) { ["a":"Foo":private]=> int(1) }