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@ 2021-04-25T16:44:40Z

<?php

$array = [
    [
        ["ID" => 2, "vendor_id" => "37", "order_id" => 776],
    ],
    [
        ["ID" => 2, "vendor_id" => "37", "order_id" => 786],
    ]
];

$result = [];
foreach ($array as $group) {
    foreach ($group as $row) {
        $result[$row['order_id']][] = $row;
    }
}
var_export($result);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)

preferences:dark modelive previewkey bindings

168.91 ms | 404 KiB | 5 Q