Online PHP editor | output for 0oL2d

@ 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 5.6.38, 7.1.0 - 7.1.23, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7: 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) } }
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 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) } }

preferences:dark modelive preview