Get Time ago format.

get_time_ago_format.php

<?php
/**
 * Get Time ago format.
 */
function timeDiff($datetime) {

    $time = time() - strtotime($datetime);

    $units = [
      31536000 => 'year',
      2592000 => 'month',
      604800 => 'week',
      86400 => 'day',
      3600 => 'hour',
      60 => 'minute',
      1 => 'second',
    ];

    foreach ($units as $unit => $val) {
      if ($time < $unit) {
        continue;
      }

      $numberOfUnits = floor($time / $unit);

      return ($val == 'second') ? 'a few seconds ago' :
             (($numberOfUnits > 1) ? $numberOfUnits : 'a')
             . ' ' . $val . (($numberOfUnits > 1) ? 's' : '') . ' ago';
    }
  }