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How make a variable global php

How make a variable global php

$a = 1;
$b = 2;
function Sum(){
    global $a, $b; // allows access to vars outside of function
    $b = $a + $b;
} 

Sum();
echo $b; // output is 3

2

Php globals

$GLOBALS["foo"]

0

Source: php.net

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