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<?php interface FooInterface { public function &get(); } class Foo implements FooInterface { protected $thing = 5; public function get() { return $this->thing; } } $foo = new Foo(); $thing = &$foo->get(); $thing = 7; var_dump($foo->get());
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Declaration of Foo::get() must be compatible with & FooInterface::get() in /in/vv78U on line 7
Process exited with code 255.

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