[PHP] String Complex (curly) syntax

- php 문자열 내부에 변수 사용하기
https://www.php.net/manual/en/language.types.string.php#language.types.string.parsing.complex

$name = "name2";
$name2 = "name3";

echo "이름은  $name: {$name} - {${$name}} 입니다.";