Testing potential PHP vulnerability.

<?php

$counter = 0;

function testfunction() {
global $counter;
    $counter++;

    return $counter;
}


$string = "* * * * * * * * * *";

// If testfunction() is called multiple times, it should show an incrementing count
// else it'll just show 1's.
print str_replace("*", testfunction(), $string);

?>