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<?php $a = function($b) { print "$b\n"; }; $a('lulz'); $b['lulz'] = $a; $b['lulz']('more lulz'); class Lulz { public $do; function __construct(callable $callable) { $this->do = $callable; } } $d = new Lulz(); $d->do('nope'); call_user_func_array(array($d, 'do'), array('nope')); $c = new stdclass(); $c->do = $a; $c->do('nope'); call_user_func_array(array($c, 'do'), array('nope'));
Output for 7.1.0
lulz more lulz Fatal error: Uncaught ArgumentCountError: Too few arguments to function Lulz::__construct(), 0 passed in /in/oGrJE on line 15 and exactly 1 expected in /in/oGrJE:11 Stack trace: #0 /in/oGrJE(15): Lulz->__construct() #1 {main} thrown in /in/oGrJE on line 11
Process exited with code 255.
Output for 7.0.0 - 7.0.14
lulz more lulz Fatal error: Uncaught TypeError: Argument 1 passed to Lulz::__construct() must be callable, none given, called in /in/oGrJE on line 15 and defined in /in/oGrJE:11 Stack trace: #0 /in/oGrJE(15): Lulz->__construct() #1 {main} thrown in /in/oGrJE on line 11
Process exited with code 255.
Output for hhvm-3.12.0
lulz more lulz Warning: __construct() expects exactly 1 parameter, 0 given in /in/oGrJE on line 13 Catchable fatal error: Argument 1 passed to Lulz::__construct() must be an instance of callable, undefined variable given in /in/oGrJE on line 13
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.0 - 5.6.28
lulz more lulz Catchable fatal error: Argument 1 passed to Lulz::__construct() must be callable, none given, called in /in/oGrJE on line 15 and defined in /in/oGrJE on line 11
Process exited with code 255.
Output for 5.3.0 - 5.3.29
lulz more lulz Catchable fatal error: Argument 1 passed to Lulz::__construct() must be an instance of callable, none given, called in /in/oGrJE on line 15 and defined in /in/oGrJE on line 11
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/oGrJE on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/oGrJE on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/oGrJE on line 3
Process exited with code 255.