<?php class Foo { public mixed $data { get => $this->data ?? null; //throw new Exception("this property is not set."); set => $this->data = $value; } public function issetData(){ return isset($this->data); } } $foo = new Foo(); var_dump($foo->issetData()); var_dump($foo->data); $foo->data = 'Hello World!!!'; var_dump($foo->issetData()); var_dump($foo->data);
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