$a

Question

why we use double dollar sign ?
what's the difference between single dollar sign and double dollar sign?

Answer 1

This is known as variable variable
For an example :
$a='x';
$b='y';
$y=15;
echo $a;//outputs as x
echo $b;//outputs as y
echo $y;//outputs as 15
echo $b;//outputs as 15

Here we need to assign the value of $b equal to another variable name. So that when we use double dollar sign it is significant.

Answer 2

it's called variable variable

$a = 'b';
$b = 'c';

echo $a; // output: b
echo $a; // output: c. $a is $b which is c

Answer 3

if there are

$a = '2';
$c = '6';
$g = '15';

that echo $c output 15?

Answer 4

var var yeah😌

Answer 5

With the $a / $a = "ba";

The variable which is called $ba will be called

Answer 6

aaaa! Thank you.