Variable variables

Variable variables

변수 변수

1 Bash

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

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

greeting="Hello World"
v1="greet"
v2="ing"
eval echo \$"$v1$v2"

2 PHP

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

$greeting = "Hello World";
$v1 = "greet";
$v2 = "ing";
echo ${$v1.$v2};
// Hello World