A reference to the relevant questions, ask everyone to help answer questions! Thanks a lot

A question about quoting, ask everyone to help answer questions! Thank you

 
 






For more information, refer to: http://www.jb51.net/article/22508.htm

When I look at a piece of article about quoting,
The author says the result is 2,
I think the result is 3,
After the operation, the result is actually 1.
Beginner PHP, the reference to it is not very understanding Ah,,,,,,
------Solution--------------------
For the sake of description, change the name of the formal parameter

Function Demo (& $x, & $y) {
  $x =& $y;

& $x is another form of representation of global $a
So
$x =& $y;
It is
Global $a;
$a =& $y;
I hope you can understand that.

The manual has: if a variable declared as global is assigned to a reference within a function, the reference is only visible inside the function.

I'm not going to say anything anymore.

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