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@ 2014-09-26T17:37:58Z

<?php
$configArray = array(
    'grand_total' => array(
        'before' => array(),
        '_code' => 'grand_total',
    ),
    'discount' => array(
        'before' => array('grand_total'),
        '_code' => 'discount',
    ),
);

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']);
    }
}

print_r($configArray);

Output for git.master, git.master_jit, rfc.property-hooks: Warning: Undefined array key "after" in /in/5KbtG on line 27 Warning: Undefined array key "after" in /in/5KbtG on line 29 Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /in/5KbtG:26 Stack trace: #0 /in/5KbtG(26): array_merge(NULL, Array, NULL) #1 {main} thrown in /in/5KbtG on line 26
Process exited with code 255.

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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