Variable variables

1 개요

Variable variables

변수 변수

• 변수값을 변수명으로 사용

2 Bash

greeting="Hello World"
ref="greeting"
echo ${!ref}
# Hello World

greeting="Hello World"
ref="greeting"
eval echo \$$ref
# Hello World

greeting="Hello World"
ref="greeting"
eval result=\$$ref
echo $result
# Hello World

greeting="Hello World"
r1="greet"
r2="ing"
eval echo \$"$r1$r2"

3 PHP

$greeting = "Hello World";
$ref= "greeting";
echo $$ref;
// Hello World

$greeting = "Hello World";
$r1 = "greet";
$r2 = "ing";
echo ${$r1.$r2};
// Hello World