PHP code output result solution

PHP code output result & lt ;? Php & nbsp; $ sum = 10; & nbsp; functiondemo ($ number) {& nbsp; $ number = $ number + 20; & nbsp ;}& nbsp; demo (& amp; $ num); PHP code output result

$ Sum = 10;
Function demo ($ number ){
$ Number = $ number + 20;
}
Demo (& $ num );
Echo $ num, "\ n ";

?>
Why is the result 20 instead of 30?

------ Solution --------------------

This is incorrect. The result is 10 and $ num is a global variable.

Should be changed

$ Num = 10;
Function demo ($ number)
{
$ Number = $ number + 20;
Return $ number;
}
$ Num = demo ($ num );
Echo $ num, "\ n ";

The result is 30.

Discussion

PHP code

/*
Deprecated: Call-time pass-by-reference has been deprecated; If you wowould like to pass it by reference, modify the declaration of demo (). if you wowould like to enable call-time pass-by-r ......

------ Solution --------------------
$ Num = 10;
Function demo (& $ number ){
$ Number = $ number + 20;
}
Demo ($ num );
Echo $ num, "\ n ";

If so, the result is 30.