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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 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: 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', ), ), ), )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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