What is meant by $x=$y ?

Question

function p ($x , $y) {

$x= $y // i dont get this
$text = $y + $x;
return $text;

}

echo p (3, "7");

I try to run the code and the answer is 14. Someone please explain me why?

Answer 1

$x= $y: assign $y's value to $x, so $x="7"
$y + $x = "7" + "7", addition will try to convert the values to numbers, so we'll have 7 + 7 = 14, this value is assigned to $text and return to the caller.
echo print out the return value of function p (which is 14).