ã€PHP8.0】PHPã«ãƒŒãƒ«ã‚»ãƒ¼ãƒ•æ¼”ç®—åãŒå°Žå…¥ã•ã‚Œã‚‹ - Qiita$user = null; echo $user->address->country ?? ''; PHPã®ãƒ—ãƒãƒ‘ティã¯å…ƒã‚ˆã‚Šnull安全ãªã®ã§ã€å˜åœ¨ã—ãªã„プãƒãƒ‘ティã ã‚ã†ãŒnullã ã‚ã†ãŒãƒ—リミティブ型ã ã‚ã†ãŒã„ããªã‚Šãƒ—ãƒãƒ‘ティをå–り出ã›ã¾ã™ã€‚ å–ã‚Œãªã„å ´åˆã¯E_NOTICEãŒç™ºç”Ÿã—ã¾ã™ãŒã€??を使ãˆã°é»™æ®ºã§ãã¾ã™ã€‚ ã—ã‹ã—メソッドã¯ã ã‚ã§ã™ã€‚ echo $user->getAddress()->getCountry() ?? ''; // Fatal error: Call to a member function getAddress() // 1 if (method_exists($user, 'getAddress')) { if (method_exists($user->getAddress(), 'getCountry')) { echo $user->getAddres
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