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run code in 150+ php & hhvm versions
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<?php function pop($f) { echo $f; } function hop(Callable $on = NULL) { if (!is_string($on)) { echo "no pat no, don't sit on that"; } echo 'mr brown get out of town'; } hop('pop'); hop(NULL);
based on L5qPA
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
mr brown get out of townno pat no, don't sit on thatmr brown get out of town
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.2.0 - 5.3.29
Catchable fatal error: Argument 1 passed to hop() must be an instance of Callable, string given, called in /in/LhLTX on line 12 and defined in /in/LhLTX on line 5
Process exited with code 255.
Output for 5.1.0 - 5.1.6
Fatal error: Argument 1 passed to hop() must be an object of class Callable, called in /in/LhLTX on line 12 and defined in /in/LhLTX on line 5
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Fatal error: Argument 1 must be an object of class Callable in /in/LhLTX on line 5
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/LhLTX on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting ')' in /in/LhLTX on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/LhLTX on line 5
Process exited with code 255.