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run code in 150+ php & hhvm versions
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<?php function aa($zz){ return 50; } $zz = "jj"; echo override_function('aa', '$zz', 'return override_strlen($zz);'); function override_strlen($zz){ return 20; }
Output for 7.0.0 - 7.1.0
Fatal error: Uncaught Error: Call to undefined function override_function() in /in/kWWFK:5 Stack trace: #0 {main} thrown in /in/kWWFK on line 5
Process exited with code 255.
Output for 5.0.0 - 5.6.28, hhvm-3.12.0
Fatal error: Call to undefined function override_function() in /in/kWWFK on line 5
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.5 - 4.4.9
Fatal error: Call to undefined function: override_function() in /in/kWWFK on line 5
Process exited with code 255.
Output for 4.3.2 - 4.4.4
Fatal error: Call to undefined function: override_function() in /in/kWWFK on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: override_function() in /in/kWWFK on line 5