The meaning and role of PHP global

All said not to write articles is not technical cattle people, next! To record my rookie growth course!

The scope of a variable is something that every programmer must consider, but in PHP it's a lot different from C + +! For example, the function inside and outside if the same variable name, but cannot be overwritten, want to refer to variables outside the function, need to use global. Next, look at the following demo:

$num =10;

function Test() {

$num = $num*10;

}

Test ();

Echo $num;

Output 10.

$num =10;

function Test() {

Global $num;

$num = $num*10;

}

Test ();

Echo $num;

Output 100. The program is not difficult, you understand it

The above describes the meaning and role of PHP global, including aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

