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run code in 150+ php & hhvm versions
Bugs & Features
<?php // explicit mention of methods that should be fluent // would be preferable to returning $this on null // since a method may very well return null as something // that is expected. interface Something { public function bar(); public function baz(); public function bat(); } interface SomethingFluent extends Something { public function bar(); public function baz(); public function bat(); } class Foo implements Something { public function bar() { var_dump(__METHOD__); } public function baz() { var_dump(__METHOD__); } public function bat() { var_dump(__METHOD__); return 'bat!'; } } class FluentWrapper extends Foo implements SomethingFluent { private $instance; private $fluentMethods; public function __construct($instance, array $fluentMethods = array()) { $this->instance = $instance; $this->fluentMethods = $fluentMethods; } public function __call($name, $args) { $result = call_user_func(array($this->instance, $name), $args); return in_array($name, $this->fluentMethods) ? $this : $result; } } class FluentFoo extends FluentWrapper { public function __construct(Foo $foo) { parent::__construct($foo, array('bar', 'baz')); } } $foo = new FluentFoo(new Foo()); $bat = $foo ->bar() ->baz() ->bar() ->baz() ->bat(); print $bat."\n";
Output for 7.0.0 - 7.1.0
string(8) "Foo::bar" Fatal error: Uncaught Error: Call to a member function baz() on null in /in/eLNrF:71 Stack trace: #0 {main} thrown in /in/eLNrF on line 71
Process exited with code 255.
Output for hhvm-3.12.0
string(8) "Foo::bar" Fatal error: Uncaught exception 'BadMethodCallException' with message 'Call to a member function baz() on a non-object (null)' in /in/eLNrF:71 Stack trace: #0 {main}
Process exited with code 255.
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.6.8 - 5.6.28
string(8) "Foo::bar" Fatal error: Call to a member function baz() on null in /in/eLNrF on line 71
Process exited with code 255.
Output for 5.3.9 - 5.5.35
string(8) "Foo::bar" Fatal error: Call to a member function baz() on a non-object in /in/eLNrF on line 71
Process exited with code 255.
Output for 5.1.0 - 5.3.8
Fatal error: Can't inherit abstract function Something::bar() (previously declared abstract in SomethingFluent) in /in/eLNrF on line 14
Process exited with code 255.
Output for 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/eLNrF on line 44
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING in /in/eLNrF on line 8
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 in /in/eLNrF on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/eLNrF on line 8
Process exited with code 255.