<?php class Word { private $word = ''; public function setWord($word) { if(!is_string($word)) { throw new InvalidArgumentException('invalid argument variable type'); } $this->word = $word; } public function getWord() { return $this->word; } } class MyWord extends Word { public function setWord($word) { parent::word = $word; } } $obj = new MyWord; $obj->setWord('hoge'); echo $obj->getWord();
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