Why the output is zero?

Question

Question:
$var = 'hello';
$car = 'world';
echo $var+$car;

Why the output is zero here?
Please can anyone explain me?

Answer 1

Because addition of string results in zero.

You have to use dot(.) to concatenate two strings.

$var = "hello";
$var2 = "world";
echo $var.$var2;

Answer 2

Thank you 🔫 Rick Grimes

Answer 3

hhj