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<?php

//phpinfo();

//exit;

$a = 10;

$b = 20;

function testSum(&$a , $b) {

$c = $a+$b;

return $c;

}

echo testSum($a, $b)."<br />";

echo $a."<br />";

function factorial($num) {

if($num == 1) return 1;

echo $num."<br />";

return $num * factorial($num-1);

}

echo factorial(10);

define("ABCD");