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@ 2020-11-30T10:29:23Z

<?php

$array = [
    [
        'avgvalue' => 0,
        'timestamp' => '2011-02-04T11:00:00.000Z',
    ],
    [
        'avgvalue' => 268.3,
        'timestamp' => '2011-02-04T12:00:00.000Z'
    ],
];

$result = [];
foreach ($array as $row) {
    $result[substr($row['timestamp'], 0, 10)][] = $row;
}
var_export($result);

Output
Performance
VLD
References
Branches

substr: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive previewkey bindings

30.98 ms | 405 KiB | 5 Q