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@ 2018-10-19T11:33:15Z

<?php
$array = array(
        array(
            'id'         => 12,
            '_from'      => 1,
            '_to'        => 2
        ),
        array(
            'id'         => 13,
            '_from'      => 4,
            '_to'        => 2
        ),
        array(
            'id'         => 14,
            '_from'      => 2,
            '_to'        => 1
        ),
    );
    $newArray = [];
    foreach ($array as $item) {
        $uniqueRecordKey = $item['_from'].'-'.$item['_to'];
        $oppositeRecordKey = $item['_to'].'-'.$item['_from'];

        //If exists record from the opposite and new ID is greater than previous put
        if (isset($newArray[$oppositeRecordKey])) {
            $newArray[$oppositeRecordKey] = $item;
            continue; //Do not append to the end
        }

        $newArray[$uniqueRecordKey] = $item;
    }

    var_dump($newArray);

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { ["1-2"]=> array(3) { ["id"]=> int(14) ["_from"]=> int(2) ["_to"]=> int(1) } ["4-2"]=> array(3) { ["id"]=> int(13) ["_from"]=> int(4) ["_to"]=> int(2) } }

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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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