How can timestamps be utilized in PHP to facilitate date sorting and manipulation?

To facilitate date sorting and manipulation in PHP, timestamps can be utilized. Timestamps represent a point in time as a Unix timestamp, which is the number of seconds that have elapsed since January 1, 1970. By converting dates to timestamps, sorting and manipulating dates becomes easier and more efficient in PHP.

// Convert a date to a timestamp
$date = "2022-01-15";
$timestamp = strtotime($date);

// Sort an array of dates using timestamps
$dates = ["2022-01-10", "2022-01-05", "2022-01-20"];
usort($dates, function($a, $b) {
    return strtotime($a) - strtotime($b);
});

// Manipulate dates using timestamps
$new_date = date("Y-m-d", strtotime("+1 week", $timestamp));