Can we do some arithmetic operation within double quotes?

Question

I wonder if we can do some arithmetic operation, like $x+$y, within a string quote?

// Expected result is:
// 5 + 11 = 16
echo "$x + $y = {$x+$y}"; // Parse error
echo "$x + $y = {$x}+{$y}"; // 5 + 11 = 5+11
echo "$x + $y = ${x+y}"; // 5 + 11 =

Answer 1

I wonder if we can do some arithmetic operation, like $x+$y, within a string quote?

Yes you can. You can just let PHP caclulate the arithmetric operation and then assign it to a variable and output it.

You can also do that inside a double-quoted string (Demo):

<?php
// @link http://stackoverflow.com/a/18182233/367456
//
// Expected result is:
// 5 + 11 = 16

$x = 5;
$y = 11;

echo "$x + $y = ${0*${0}=$x + $y}"; # prints "5 + 11 = 16"

However that is probably not what you're looking for.

Answer 2

try this below code :

<?php
    $x =5;
    $y =11;
echo "$x + $y = ".($x+$y);
?>

and also refer this Fiddle

Answer 3

echo "$x + $y = ".($x+$y);

You may do it like this.

Answer 4

use the following format and must like

                $a=10;$b=12;
                 echo "$a+$b"."=".($a+$b);

Answer 5

You will need to do it like this, change the below line from

echo "$x + $y = {$x}+{$y}"; // 5 + 11 = 5+11

To

echo "$x + $y = ".($x+$y); // 5 + 11 = 16

Answer 6

You have posted that Your required output is // 5 + 11 = 16 .

So You may try the below code.

$x = 5;
$y = 11;
echo "$x + $y=".($x+$y);

I think this will give Your required output.