PHP strpos问题

如何解决PHP strpos问题

| 我有一个脚本，该脚本使用cURL从站点中获取页面，而我试图逐行将其切开，然后提取我需要的内容并删除该行。问题是，有时它会为我提供正确位置的项目，有时它不会根据行的不同而交替显示。我试图使用以下页面之一：http://www.gametracker.com/search/ 我使用的代码是：

while (strpos($contents,\'<tr>\'))
{
    $start = strpos($contents,\'<tr>\');
    $end = strpos($contents,\'</tr>\',$start) + 5;
    $rstring = substr($contents,$start,$end - $start);
    $contents = str_replace($rstring,\'\',$contents);
    //nameee
        $start = strpos($rstring,\'[clantag]\');
    $end = strpos($rstring,\'</a>\',$start);
    $name= trim(substr($rstring,$end - $start));
    echo $name . \'<br/>\';
        //players
    $search = \'<td class=\"c05 item_bgcolor_even\">\';
        $start = (strpos($rstring,$search) + strlen($search));
    $end = strpos($rstring,\"</td>\",$start);
    $players= trim(substr($rstring,($end - $start)));
    echo $players . \'<br />\';
    $map;
    $curPlayers;
    $maxPlayers;
    $ip;
}

它正确地获得了服务器名称，但是当涉及到玩家时，一行获得了服务器名称，另一行则获得了lor_odd \“> 1230。

解决方法

使用DOM解析器将变得更加容易：

libxml_use_internal_errors(true);

$dom = new DOMDocument;
$dom->loadHTMLFile(\'http://www.gametracker.com/search/\');
$xpath = new DOMXPath($dom);

// Get the rows from the search list
$rows = $xpath->query(\'//table[@class=\"table_lst table_lst_srs\"]/tr\');

for ($i=1; $i<$rows->length-1; $i++) {
    $row = $rows->item($i);

    // Get the columns for a row
    $cols = $row->getElementsByTagName(\'td\');

    // Get the server name (3rd column)
    echo \'Name: \'.trim($cols->item(2)->textContent).PHP_EOL;

    // Get the player count (5th column)
    echo \'Players: \'.trim($cols->item(4)->textContent).PHP_EOL.PHP_EOL;
}

输出：

Name: NoobonicPlague.com | 24/7 RP,FastDL,Custom Mods
Players: 55/65

Name: RUS Coop-20 Semantic #1 (2.0.7.0)
Players: 20/20

Name: TAW.net -(Dallas)
Players: 32/32

Name: Dedicated
Players: 0/12

...

, 您一直在为此类处理编写“错误”的代码。很难理解和维护，更不用说调试了。如果您愿意放弃手动的HTML解析并改为使用XPath查询，那么您的生活将变得更加轻松：

$doc = new DOMDocument();
$doc->loadHTML($contents); // $contents = the HTML that curl returns

$xpath = new DOMXPath($doc);

// You can now use as many XPath queries as you like; they look like this:
$nodes = $xpath->query(\'\'); // you own query expression here
foreach ($nodes as $node) {
    $v = $node->nodeValue; // now do something with $v
}

如何解决PHP strpos问题

解决方法

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