How Can I Sort a Multidimensional PHP Array by Date?

Sorting Multidimensional PHP Arrays by Date Element

Consider an array of arrays, where each inner array (record) contains a "datetime" element in YYYY-MM-DD HH:MM:SS format. The task is to sort the records within the array in ascending or descending order based on this date.

To address this, the usort() function provides a versatile solution:

function date_compare($a, $b) {
    $t1 = strtotime($a['datetime']);
    $t2 = strtotime($b['datetime']);
    return $t1 - $t2;
}

Here, the date_compare() function extracts UNIX timestamps from the "datetime" fields of the compared records. The difference between these timestamps determines the sorting order.

usort($array, 'date_compare');

By passing the array to usort() with the date_compare() function as the comparison callback, the records will be sorted according to the extracted timestamps. This approach is convenient and efficient for ordering multidimensional arrays by date elements.

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