Human readable elapsed time.

time_elapsed_string

<?php 

function time_elapsed_string($ptime){
    $etime = time() - $ptime;
    if ($etime < 1)
        return '0 seconds';

    $a = array( 12 * 30 * 24 * 60 * 60  =>  'año',
                30 * 24 * 60 * 60       =>  'meses',
                24 * 60 * 60            =>  'día',
                60 * 60                 =>  'hora',
                60                      =>  'minuto',
                1                       =>  'segundo'
                );

    foreach ($a as $secs => $str) {
        $d = $etime / $secs;
        if ($d >= 1)
        {
            $r = round($d);
            if($r > 1)
            {
                $end = ($str == 'mes') ? 'es' : 's';
            }
            return "Hace {$r} {$str}{$end}";
        }
    }
    
}