php抓取这个网页的数据，只要数据，不要html内容，然后json后写入文件，新手求教

$url = 'http://www.okooo.com/Upload/sohu/table_23.html';$s = file_get_contents($url);preg_match_all('#<table.+</table>#isU', $s, $m);foreach(array_map('strip_tags', $m[0]) as $r) {  $a = preg_split('/\s+/', $r, -1, PREG_SPLIT_NO_EMPTY);  $res[] = array_chunk(array_slice($a, 0, -1), 3);}print_r($res);echo json_encode($res);

Array(    [0] => Array        (            [0] => Array                (                    [0] => 排名                    [1] => 球队                    [2] => 积分                )            [1] => Array                (                    [0] => 1                    [1] => 尤文图斯                    [2] => 102                )            [2] => Array                (                    [0] => 2                    [1] => 罗马                    [2] => 85                )            [3] => Array                (                    [0] => 3                    [1] => 那不勒斯                    [2] => 78                )            [4] => Array                (                    [0] => 4                    [1] => 佛罗伦萨                    [2] => 65                )            [5] => Array                (                    [0] => 5                    [1] => 国际米兰                    [2] => 60                )            [6] => Array                (                    [0] => 6                    [1] => 帕尔马                    [2] => 58                )            [7] => Array                (                    [0] => 7                    [1] => 都灵                    [2] => 57                )            [8] => Array                (                    [0] => 8                    [1] => AC米兰                    [2] => 57                )            [9] => Array                (                    [0] => 9                    [1] => 拉齐奥                    [2] => 56                )            [10] => Array                (                    [0] => 10                    [1] => 维罗纳                    [2] => 54                )        )    [1] => Array        (            [0] => Array                (                    [0] => 进球数                    [1] => 球员                    [2] => 球队                )            [1] => Array                (                    [0] => 22                    [1] => 伊莫比莱                    [2] => 都灵                )            [2] => Array                (                    [0] => 20                    [1] => 托尼                    [2] => 维罗纳                )            [3] => Array                (                    [0] => 19                    [1] => 特维斯                    [2] => 尤文图斯                )            [4] => Array                (                    [0] => 17                    [1] => 帕拉西奥                    [2] => 国际米兰                )            [5] => Array                (                    [0] => 17                    [1] => 伊瓜因                    [2] => 那不勒斯                )            [6] => Array                (                    [0] => 16                    [1] => 略伦特                    [2] => 尤文图斯                )            [7] => Array                (                    [0] => 16                    [1] => 迪纳塔莱                    [2] => 乌迪内斯                )            [8] => Array                (                    [0] => 16                    [1] => 朱塞佩·罗西                    [2] => 佛罗伦萨                )            [9] => Array                (                    [0] => 16                    [1] => 贝拉尔迪                    [2] => 莎索罗                )            [10] => Array                (                    [0] => 15                    [1] => 卡列洪                    [2] => 那不勒斯                )        ))[[["\u6392\u540d","\u7403\u961f","\u79ef\u5206"],["1","\u5c24\u6587\u56fe\u65af","102"],["2","\u7f57\u9a6c","85"],["3","\u90a3\u4e0d\u52d2\u65af","78"],["4","\u4f5b\u7f57\u4f26\u8428","65"],["5","\u56fd\u9645\u7c73\u5170","60"],["6","\u5e15\u5c14\u9a6c","58"],["7","\u90fd\u7075","57"],["8","AC\u7c73\u5170","57"],["9","\u62c9\u9f50\u5965","56"],["10","\u7ef4\u7f57\u7eb3","54"]],[["\u8fdb\u7403\u6570","\u7403\u5458","\u7403\u961f"],["22","\u4f0a\u83ab\u6bd4\u83b1","\u90fd\u7075"],["20","\u6258\u5c3c","\u7ef4\u7f57\u7eb3"],["19","\u7279\u7ef4\u65af","\u5c24\u6587\u56fe\u65af"],["17","\u5e15\u62c9\u897f\u5965","\u56fd\u9645\u7c73\u5170"],["17","\u4f0a\u74dc\u56e0","\u90a3\u4e0d\u52d2\u65af"],["16","\u7565\u4f26\u7279","\u5c24\u6587\u56fe\u65af"],["16","\u8fea\u7eb3\u5854\u83b1","\u4e4c\u8fea\u5185\u65af"],["16","\u6731\u585e\u4f69\u00b7\u7f57\u897f","\u4f5b\u7f57\u4f26\u8428"],["16","\u8d1d\u62c9\u5c14\u8fea","\u838e\u7d22\u7f57"],["15","\u5361\u5217\u6d2a","\u90a3\u4e0d\u52d2\u65af"]]]