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<?php class Abc { public const TICKET_SEND_AUTO_RESPONSE = 0; public function test() { $s = <<<XML <sendautoresponder>{self::TICKET_SEND_AUTO_RESPONSE}</sendautoresponder> XML; return $s; } } $t = new Abc(); var_dump($t->test());
based on i8tMd

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Output for Arrow functions
string(84) " <sendautoresponder>{self::TICKET_SEND_AUTO_RESPONSE}</sendautoresponder>"

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