I have 4 variables like the below.
Code:
code

$a=48;
$b=9;
$c=52;
$d=183;
I like to produce "9 48 52 183" with the code above.

The would-be code below doesn't work correctly, but I hope it shows what I want.

Code:
would-be code

echo order($a, $b, $c, $d);

target result
9
48
52
183
How can I get my target result above with the 4 variables?