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<?php ///on php version < 8.4 class Foo { private $data = null; public function issetData(){ return $this->data !== null; } public function setData($data){ $this->data = $data; } } $foo = new Foo(); var_dump($foo->issetData()); $foo->setData(123); var_dump($foo->issetData());
Output for git.master_jit, git.master
bool(false) bool(true)

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