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@ 2019-04-20T12:43:39Z

<?php

function find_pairs($array) {
    // re-index to 0
    $array = array_values($array['parent_id']);
    // sort so the longest arrays are first
    usort($array, function ($a, $b) { return count($b) - count($a); });
    // output array
    $pairs = array();
    for ($i = 0, $j = 1; $i < count($array) - 1; $i++) {
        if (!count($array[$i])) continue;
        while ($j <= $i || $j < count($array) && !count($array[$j])) $j++;
        while (count($array[$i]) && isset($array[$j]) && count($array[$j])) {
            $pairs[] = array(array_shift($array[$i]), array_shift($array[$j]));
            // exhausted other arrays elements?
            while ($j < count($array) && !count($array[$j])) $j++;
        }
    }
    return $pairs;
}

$array = array (
    'parent_id' => 
    array (
        0 => 
        array (
            0 => 12
        ),
        1 => 
        array (
            0 => 22
        ),
        2 => 
        array (
            0 => 23,
            1 => 24
        )
    )
);
print_r(find_pairs($array));

$array = array (
    'parent_id' => 
    array (
        9 => 
        array (
            0 => 12
        ),
        20 => 
        array (
            0 => 25,
            1 => 22
        ),
        21 => 
        array (
            0 => 23,
            1 => 24
        )
    )
);
print_r(find_pairs($array));

$array = array (
    'parent_id' => 
    array (
        9 => 
        array (
            0 => 11,
            1 => 12
        ),
        10 => 
        array (
            0 => 13,
            1 => 14
        ),
        20 => 
        array (
            0 => 21,
            1 => 22
        ),
        21 => 
        array (
            0 => 23
        )
    )
);
print_r(find_pairs($array));

Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13: Array ( [0] => Array ( [0] => 23 [1] => 12 ) [1] => Array ( [0] => 24 [1] => 22 ) ) Array ( [0] => Array ( [0] => 25 [1] => 23 ) [1] => Array ( [0] => 22 [1] => 24 ) ) Array ( [0] => Array ( [0] => 11 [1] => 13 ) [1] => Array ( [0] => 12 [1] => 14 ) [2] => Array ( [0] => 21 [1] => 23 ) )
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33: Array ( [0] => Array ( [0] => 23 [1] => 12 ) [1] => Array ( [0] => 24 [1] => 22 ) ) Array ( [0] => Array ( [0] => 23 [1] => 25 ) [1] => Array ( [0] => 24 [1] => 22 ) ) Array ( [0] => Array ( [0] => 11 [1] => 13 ) [1] => Array ( [0] => 12 [1] => 14 ) [2] => Array ( [0] => 21 [1] => 23 ) )

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