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<?php class foo { static $bar; } foo::$bar = function () { echo "Hello World"; }; foo::$bar();
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
Warning: Undefined variable $bar in /in/a4EKT on line 4 Fatal error: Uncaught Error: Method name must be a string in /in/a4EKT:4 Stack trace: #0 {main} thrown in /in/a4EKT on line 4
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 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: bar in /in/a4EKT on line 4 Fatal error: Uncaught Error: Function name must be a string in /in/a4EKT:4 Stack trace: #0 {main} thrown in /in/a4EKT on line 4
Process exited with code 255.
Output for 7.3.32 - 7.3.33
Fatal error: Uncaught Error: Function name must be a string in /in/a4EKT:4 Stack trace: #0 {main} thrown in /in/a4EKT on line 4
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28
Notice: Undefined variable: bar in /in/a4EKT on line 4 Fatal error: Function name must be a string in /in/a4EKT on line 4
Process exited with code 255.

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