How can multidimensional arrays with elements in German date notation be effectively sorted in PHP?

When sorting multidimensional arrays with elements in German date notation in PHP, you can use the `usort()` function along with a custom comparison function. This function can convert the German date format to a format that PHP's `strtotime()` function can understand for proper sorting. 

// Sample multidimensional array with German date notation
$array = [
    ['date' => '15.03.2021'],
    ['date' => '10.01.2021'],
    ['date' => '25.12.2020']
];

// Custom comparison function to sort dates in German format
usort($array, function($a, $b) {
    $dateA = date_create_from_format('d.m.Y', $a['date']);
    $dateB = date_create_from_format('d.m.Y', $b['date']);
    
    if ($dateA == $dateB) {
        return 0;
    }
    return ($dateA < $dateB) ? -1 : 1;
});

// Output sorted array
print_r($array);

Keywords

multidimensional arrays German date notation sorting PHP date_format

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