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run code in 200+ php & hhvm versions
Bugs & Features
<?php class Foo { protected $callback; public function setCallback($callback) { $this->callback = $callback; } public function callCallback() { return call_user_func($this->callback); } } class Bar { protected $foo; public function __construct(Foo $foo) { $this->foo = $foo; $self =& $this; $callback = function() use ($self) { return $this->protectedCallback(); }; $this->foo->setCallback($callback); } protected function protectedCallback() { return "callback called"; } } $foo = new Foo; $bar = new Bar($foo); echo $foo->callCallback();
Output for 5.4.0 - 5.6.30, hhvm-3.10.1, hhvm-3.12.14 - 3.17.3, 7.0.0 - 7.2.0
callback called
Output for hhvm-3.11.1

Process exited with code 137.
Output for 5.3.0 - 5.3.29
Fatal error: Using $this when not in object context in /in/Cbrkb on line 28
Process exited with code 255.
Output for 5.1.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/Cbrkb on line 27
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/Cbrkb on line 27
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/Cbrkb 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 T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/Cbrkb on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/Cbrkb on line 5
Process exited with code 255.