PHP strpos问题

Question

我有一个使用cURL从站点获取页面的脚本，我试图将其逐行剪切，然后提取所需内容并删除该行。问题是，有时它会给我一个项目的正确位置，有时它不会取决于哪一行，它交替。

我正在尝试使用其中的一个页面：http://www.gametracker.com/search/

im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, $start, $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, $start, ($end - $start)));
    echo $players . '<br />';
    $map;
    $curPlayers;
    $maxPlayers;
    $ip;
}

它正确地获得了服务器名称，但是当涉及到播放器时，一行我得到了它们，另一行我得到了lor_odd"> 1230。

Answer 1

有了DOM parser，事情就简单多了

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

...

Answer 2

您一直在为这种处理编写“错误”类型的代码。它很难理解和维护，更不用说调试了。

如果您愿意放弃手动的超文本标记语言解析，转而使用XPath查询，那么您的工作将变得容易得多：

$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
}