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@ 2018-05-16T13:38:27Z

<?php
$array1 = array(
    'data' => array(
        array(
            'raw' => array(
                'key1' => array('value1', 'value1_1'),
                'key3' => 'value3',
            ),
        ),
        array(
            'raw' => array(
                'key1' => array('value1_3', 'value1_4'),
                'key2' => 'value3_1',
            ),
        ),
    ),
);

$array2 = array(
    'data' => array(
       array(
           'raw' => array(
               'key1' => 'value1_2',
               'key2' => 'value2',
               'key3' => array('value3_1', 'value3_2'),
           )
       )
    )
);

foreach ($array1['data'] as $set) {
    foreach ($set['raw'] as $k => $v) {
        if (!isset($result['data']['raw'][$k])) {
            $result['data']['raw'][$k] = $v;
        }else {
            $result['data']['raw'][$k] = array_merge((array)$result['data']['raw'][$k],(array)$v);
        }
    }
}
foreach ($array2['data'] as $set) {
    foreach ($set['raw'] as $k => $v) {
        if (!isset($result['data']['raw'][$k])) {
            $result['data']['raw'][$k] = $v;
        }else{
            $result['data']['raw'][$k] = array_merge((array)$result['data']['raw'][$k],(array)$v);
        }
    }
}
var_export($result);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 'data' => array ( 'raw' => array ( 'key1' => array ( 0 => 'value1', 1 => 'value1_1', 2 => 'value1_3', 3 => 'value1_4', 4 => 'value1_2', ), 'key3' => array ( 0 => 'value3', 1 => 'value3_1', 2 => 'value3_2', ), 'key2' => array ( 0 => 'value3_1', 1 => 'value2', ), ), ), )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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