Why the result is 0 in the script below?

Question

https://code.sololearn.com/wXhOF1ZxuxXV/?ref=app
Strasse answer but fact.

Answer 1

idk its kinda part of php where string that doesnt have recognizeable numeric at the start will result in 0 if casted.

since the operation is + i think php will treat the variable as number, so it'll cast that to number which is 0 for both of them. so 0 + 0 = 0.

the result will be different if you use $crbl="7 world";

Answer 2

If you Wand to combine strings use
$combined=$first . $second

Answer 3

OK, I expected - hello world.
Thanks, all of You, espacially to You, David.

Answer 4

EGO What result were you expecting?

Answer 5

every one but not 0 -:) BEFORE these posts.

Answer 6

So, IF You write echo $crbl, it is appeared 'world' but not zero.

Answer 7

EGO PHP uses the dot (.) operator to concatenate string values.

Therefore, the following line would result in "helloworld":

$vrbl . $crbl

However, the code is using the plus (+) operator, which will attempt an arithmetic addition on the 2 operands.

If the operand is a string with a value that cannot be converted into a number, it appears that PHP will use the default integer value, which is 0.

Therefore, "hello" + "world" is essentially the same as 0 + 0.