PHP 특수함수(Magic method)
Function: __construct() __desctruct() __call() __callStatic() __get() __set() __isset() __unset() __sleep() __wakeup() __serialinze() __unserialize() __toString() __invoke() __set_state() __clone() __debugInfo() 참조: www.php.net/manual/en/language.oop5.magic.php
2021.01.12