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@ 2024-11-29T03:05:04Z

<?php

$array = [
    [
        ["2011-11-18 00:00:00" => 'C'],
        ["2011-11-18 00:00:00" => 'I'],
        ["2011-11-18 00:00:00" => 'S'],
    ],
    [
        ["2011-11-22 00:00:00" => 'C'],
        ["2011-11-22 00:00:00" => 'S']
    ]
];

$result = [];
foreach ($array as $set) {
    $result[key($set[0])] = count($set); 
}
var_export($result);

Output
Performance
VLD
References
Branches

var_export: documentation ( source)
key: documentation ( source)

preferences:dark modelive previewkey bindings

12.75 ms | 405 KiB | 5 Q