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<?php class Foo { public $something = ['something' => 'yes']; public function bar() { $baseProperty = 'something'; $index = 'somethingElse'; echo $this->{$baseProperty}[$index]; } } (new Foo)->bar();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Undefined array key "somethingElse" in /in/OUVKH on line 11

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