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<?php class Foo { public function sing() { var_dump('Do re mi!'); } public function dance() { var_dump('Cha cha cha!'); } } function gimmeFoo(Foo $foo) { $foo->sing(); $foo->dance(); } $gimmeWhat = new ReflectionFunction('gimmeFoo'); $class = $gimmeWhat->getParameters()[0]->getClass(); $methods = $class->getMethods(); $evil = " class Fake extends $class->name { public function idoeverything() { var_dump('Just kidding!'); } "; foreach ($methods as $method) { $evil .= "public function $method->name() {\$this->idoeverything();}"; } $evil .= "}"; eval($evil); $fake = new Fake; gimmeFoo($fake);
Output for 5.4.0 - 5.6.21, hhvm-3.12.0, 7.0.0 - 7.1.0
string(13) "Just kidding!" string(13) "Just kidding!"
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/uMXpl on line 23
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/uMXpl on line 23
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/uMXpl 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/uMXpl 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/uMXpl on line 5
Process exited with code 255.