使用示例：
echo time_elapsed_string('2013-05-01 00:22:35');echo time_elapsed_string('@1367367755'); # timestamp inputecho time_elapsed_string('2013-05-01 00:22:35', true);输入可以是任何受支持的日期和时间格式。
输出：
4 months ago4 months, 2 weeks, 3 days, 1 hour, 49 minutes, 15 seconds ago
功能说明
function time_elapsed_string($datetime, $full = false) { $now = new DateTime; $ago = new DateTime($datetime); $diff = $now->diff($ago); $diff->w = floor($diff->d / 7); $diff->d -= $diff->w * 7; $string = array( 'y' => 'year', 'm' => 'month', 'w' => 'week', 'd' => 'day', 'h' => 'hour', 'i' => 'minute', 's' => 'second', ); foreach ($string as $k => &$v) { if ($diff->$k) { $v = $diff->$k . ' ' . $v . ($diff->$k > 1 ? 's' : ''); } else { unset($string[$k]); } } if (!$full) $string = array_slice($string, 0, 1); return $string ? implode(', ', $string) . ' ago' : 'just now';}
