请教，php中如果返回文本末尾5行数据

1305140646,9,1,4,22013-5-14 16:40:00
1305140652,0,1,4,82013-5-14 16:50:00
1305140664,3,4,6,22013-5-14 17:00:00
1305140676,9,4,1,22013-5-14 17:10:00
1305140683,9,1,5,02013-5-14 17:20:00
1305140697,0,4,7,82013-5-14 17:30:00
1305140703,0,3,0,02013-5-14 17:40:00
1305140711,5,3,8,92013-5-14 17:50:00
1305140723,4,4,6,82013-5-14 18:00:00
1305140737,8,8,5,32013-5-14 18:10:00

请教，php中，如何返回某文本（行高是动态的）最后5行数据。
希望得到的结果如下

1305140697,0,4,7,82013-5-14 17:30:00
1305140703,0,3,0,02013-5-14 17:40:00
1305140711,5,3,8,92013-5-14 17:50:00
1305140723,4,4,6,82013-5-14 18:00:00
1305140737,8,8,5,32013-5-14 18:10:00

[解决办法]
不是一样吗？

$a = file('http://web45800.w221.vhost058.cn/test.php');
print_r(array_slice($a, -5));

Array
(
[0] => 1305140824,3,0,0,42013-5-14 19:40:00

[1] => 1305140833,2,7,4,02013-5-14 19:50:00

[2] => 1305140842,5,9,9,42013-5-14 20:00:00

[3] => 1305140855,8,1,7,72013-5-14 20:10:00

[4] => 1305140861,3,7,5,72013-5-14 20:20:00
)