Little php coding stuff

Iam using below code to test with some global variable. it seems that global variable cannot be compared inside a function..

why its not displaying ‘hello world’ in the output?

below is the code that iam trying.

<?php    
$bool = 1;

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

when I remove function boo(), its getting displayed ‘hello world’. may i know why it not displaying when function exists?

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