Question

Possible Duplicate:
php function variable scope

I am using below code to test with a global variable. It seems that a global variable cannot be compared inside a function.

Why is it not displaying ‘hello world’ in the output?

Below is the code that I am trying:

<?php    
$bool = 1;

function boo() {
    if ($bool == 1) {
        $bool = 2;
        echo 'Hello World';    
    }
}
?> 

When I remove function boo(), ‘hello world’ is displayed. Why is it not displaying when function exists?

Answer 1

Looks like homework, still:

<?php

$bool = 1;

boo();

function boo() {
global $bool;

if ($bool == 1) {
$bool = 2;
echo 'Hello World';

}


}
?> 

Or

<?php

$bool = 1;

boo(&$bool);

function boo(&$bool) {

if ($bool == 1) {
$bool = 2;
echo 'Hello World';

}


}
?>