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/**
 * Bootstrapping functions, essential and needed for Anax to work together with some common helpers. 
 *
 */



/**
 * Utility for debugging.
 *
 * @param mixed $array values to print out
 *
 * @return void
 */
function dump($array) 
{
    echo "<pre>" . htmlentities(print_r($array, 1)) . "</pre>";
}



/**
 * Sort array but maintain index when compared items are equal.
 * http://www.php.net/manual/en/function.usort.php#38827
 *
 * @param array    &$array       input array
 * @param callable $cmp_function custom function to compare values
 *
 * @return void
 *
 */
function mergesort(&$array, $cmp_function) 
{
    // Arrays of size < 2 require no action.
    if (count($array) < 2) return;
    // Split the array in half
    $halfway = count($array) / 2;
    $array1 = array_slice($array, 0, $halfway);
    $array2 = array_slice($array, $halfway);
    // Recurse to sort the two halves
    mergesort($array1, $cmp_function);
    mergesort($array2, $cmp_function);
    // If all of $array1 is <= all of $array2, just append them.
    if (call_user_func($cmp_function, end($array1), $array2[0]) < 1) {
        $array = array_merge($array1, $array2);
        return;
    }
    // Merge the two sorted arrays into a single sorted array
    $array = array();
    $ptr1 = $ptr2 = 0;
    while ($ptr1 < count($array1) && $ptr2 < count($array2)) {
        if (call_user_func($cmp_function, $array1[$ptr1], $array2[$ptr2]) < 1) {
            $array[] = $array1[$ptr1++];
        } else {
            $array[] = $array2[$ptr2++];
        }
    }
    // Merge the remainder
    while ($ptr1 < count($array1)) $array[] = $array1[$ptr1++];
    while ($ptr2 < count($array2)) $array[] = $array2[$ptr2++];
    return;
}
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