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<?php class A {} class B {} interface Handler { public function handle(&$alterValue); } class FooHandler implements Handler { public function handle(&$alterValue) { $alterValue .= ' is altered'; } } $m = 'Foo'; $fh = new FooHandler; var_dump($m); $fh->handle($m); var_dump($m);
Output for git.master, git.master_jit, rfc.property-hooks
string(3) "Foo" string(14) "Foo is altered"

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