How to Sort an Array of Objects by Date in Ascending Order (PHP)?

Sorting Objects by Date

Sorting arrays of objects by a specific date field can be useful in various scenarios. This article explores how to sort an array of objects by the "date" field in ascending order, displaying the oldest objects first.

Problem:

Given an array of objects with a "date" property, how can it be rearranged so that the oldest objects appear first?

Solution:

To sort the array, the PHP's usort() function can be employed. This function accepts two comparator functions that compare the objects to determine their order. The comparator functions below can be used:

<code class="php">usort($array, function($a, $b) {
    return strtotime($a['date']) - strtotime($b['date']);
});</code>

For PHP versions prior to 5.3, a separate comparator function is recommended:

<code class="php">function cb($a, $b) {
    return strtotime($a['date']) - strtotime($b['date']);
}
usort($array, 'cb');</code>

By using these comparator functions, the array will be sorted according to the "date" field, with the oldest objects appearing at the beginning of the array.

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