Online PHP editor | rfc for dcKnX

@ 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 git.master, git.master_jit, rfc.property-hooks: 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 ) )

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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
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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
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2015-02-14 Union Types - declined
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