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@ 2014-09-26T17:29:18Z

<?php
$configArray = array(
    'grand_total' =>
        array(
            'class' => 'sales/quote_address_total_grand',
            'after' =>
                array(
                    0 => 'subtotal',
                ),
            'renderer' => 'tax/checkout_grandtotal',
            'admin_renderer' => 'adminhtml/sales_order_create_totals_grandtotal',
            'before' =>
                array(),
            '_code' => 'grand_total',
        ),
    'discount' =>
        array(
            'class' => 'salesrule/quote_discount',
            'after' =>
                array(
                    0 => 'subtotal',
                    1 => 'shipping',
                ),
            'before' =>
                array(
                    0 => 'grand_total',
                ),
            'admin_renderer' => 'adminhtml/sales_order_create_totals_discount',
            'renderer' => 'amrules/checkout_discount',
            '_code' => 'discount',
        ),
);

function compareTotals($a, $b)
{
    $aCode = $a['_code'];
    $bCode = $b['_code'];
    if (in_array($aCode, $b['after']) || in_array($bCode, $a['before'])) {
        $res = -1;
    } elseif (in_array($bCode, $a['after']) || in_array($aCode, $b['before'])) {
        $res = 1;
    } else {
        $res = 0;
    }
    return $res;
}

reset($configArray);
$element = current($configArray);
foreach ($configArray as $code => $data) {
    foreach ($data['before'] as $beforeCode) {
        if (!isset($configArray[$beforeCode])) {
            continue;
        }
        $configArray[$code]['before'] = array_unique(array_merge(
                $configArray[$code]['before'], $configArray[$beforeCode]['before']
            ));
        $configArray[$beforeCode]['after'] = array_merge(
            $configArray[$beforeCode]['after'], array($code), $data['after']
        );
        $configArray[$beforeCode]['after'] = array_unique($configArray[$beforeCode]['after']);
    }
    foreach ($data['after'] as $afterCode) {
        if (!isset($configArray[$afterCode])) {
            continue;
        }
        $configArray[$code]['after'] = array_unique(array_merge(
                $configArray[$code]['after'], $configArray[$afterCode]['after']
            ));
        $configArray[$afterCode]['before'] = array_merge(
            $configArray[$afterCode]['before'], array($code), $data['before']
        );
        $configArray[$afterCode]['before'] = array_unique($configArray[$afterCode]['before']);
    }
}
uasort($configArray, 'compareTotals');

print_r($configArray);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [discount] => Array ( [class] => salesrule/quote_discount [after] => Array ( [0] => subtotal [1] => shipping ) [before] => Array ( [0] => grand_total ) [admin_renderer] => adminhtml/sales_order_create_totals_discount [renderer] => amrules/checkout_discount [_code] => discount ) [grand_total] => Array ( [class] => sales/quote_address_total_grand [after] => Array ( [0] => subtotal [1] => discount [3] => shipping ) [renderer] => tax/checkout_grandtotal [admin_renderer] => adminhtml/sales_order_create_totals_grandtotal [before] => Array ( ) [_code] => grand_total ) )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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