How to Convert Timestamps to Relative Date/Time in PHP?

PHP: Converting Timestamps to Relative Date/Time

Relative timestamps indicate the time elapsed between a given point in time and the current moment. They provide a more user-friendly representation of time than absolute timestamps, especially for events that occurred in the past or will occur in the future.

To generate relative timestamps in PHP, consider using the following function:

function time2str($ts)
{
    if (!ctype_digit($ts)) {
        $ts = strtotime($ts);
    }

    $diff = time() - $ts;
    if ($diff == 0) {
        return 'now';
    } elseif ($diff > 0) {
        // Past timestamps
        $day_diff = floor($diff / 86400);
        if ($day_diff == 0) {
            if ($diff < 60) {
                return 'just now';
            } elseif ($diff < 120) {
                return '1 minute ago';
            } elseif ($diff < 3600) {
                return floor($diff / 60) . ' minutes ago';
            } elseif ($diff < 7200) {
                return '1 hour ago';
            } elseif ($diff < 86400) {
                return floor($diff / 3600) . ' hours ago';
            }
        } elseif ($day_diff == 1) {
            return 'Yesterday';
        } elseif ($day_diff < 7) {
            return $day_diff . ' days ago';
        } elseif ($day_diff < 31) {
            return ceil($day_diff / 7) . ' weeks ago';
        } elseif ($day_diff < 60) {
            return 'last month';
        } else {
            return date('F Y', $ts);
        }
    } else {
        // Future timestamps
        $diff = abs($diff);
        $day_diff = floor($diff / 86400);
        if ($day_diff == 0) {
            if ($diff < 120) {
                return 'in a minute';
            } elseif ($diff < 3600) {
                return 'in ' . floor($diff / 60) . ' minutes';
            } elseif ($diff < 7200) {
                return 'in an hour';
            } elseif ($diff < 86400) {
                return 'in ' . floor($diff / 3600) . ' hours';
            }
        } elseif ($day_diff == 1) {
            return 'Tomorrow';
        } elseif ($day_diff < 4) {
            return date('l', $ts);
        } elseif ($day_diff < 7 + (7 - date('w'))) {
            return 'next week';
        } elseif (ceil($day_diff / 7) < 4) {
            return 'in ' . ceil($day_diff / 7) . ' weeks';
        } elseif (date('n', $ts) == date('n') + 1) {
            return 'next month';
        } else {
            return date('F Y', $ts);
        }
    }
}

This function accepts a timestamp and outputs a relative timestamp. It handles both past and future timestamps, and it provides outputs in a variety of formats, such as "1 hour ago" or "in 2 days."

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