timeago.php

<?php declare(strict_types=1);

// based on SO answer by Galvic
// https://stackoverflow.com/a/18602474/7427482

function timeago(DateTime $ago, bool $full = false): string {
            $now = new DateTime();
            $diff = $now->diff($ago);

            $values = [
                'year' => $diff->y,
                'month' => $diff->m,
                'week' => $w = floor($diff->d / 7),
                'day' => $diff->d - ($w * 7),
                'hour' => $diff->h,
                'minute' => $diff->i,
                'second' => $diff->s,
            ];
            
            foreach ($values as $key => $value) {
                if ($value > 0) {
                    $values[$key] = $value . ' ' . $key . ($value > 1 ? 's' : '');
                } else {
                    unset($values[$key]);
                }
            }

            if (!$full) {
                $values = array_slice($values, 0, 1);
            }
            
            return count($values) > 0 ? implode(', ', $values) . ' ago' : 'just now';
            
     }
     
     echo timeago(new DateTime('@1578')) . PHP_EOL; // 48 years ago
     echo timeago(new DateTime('@1578'), true) . PHP_EOL; // 48 years, 9 months, 3 weeks, 1 day, 16 hours, 30 minutes ago
     echo timeago(new DateTime()) . PHP_EOL; // just now