Why does "/" . date("Y") + 1 in PHP return 1?

Why does "/" . date("Y") + 1 in PHP return 1?

And a similar question开发者_开发问答, why does date("Y") . "/" . date("Y") + 1 return 2011?

I am quessing it has something to do with operator precedence, because date("Y") . "/" . (date("Y") + 1) does return the expected "2010/2011"

Yep. . binds more tightly than +, so:

"/" . date("Y") + 1

is parsed as:

("/" . date("Y")) + 1

The left side doesn't start with any numbers, so when you convert it to a number, it becomes 0. Same with the latter:

(date("Y") . "/" . date("Y")) + 1

The left side of the + starts with 2010 then some non-digits, so when it gets converted to a number, it becomes 2010. Then you add 1.

when you use point . thats mean that a string and after that your try to + this string whith a integer , that not logical