从IMDB中提取电影ID

Question

我正在想办法从这个页面上只获取电影的id。

http://www.imdb.com/movies-in-theaters/2013-05/

我有这个，但我不能用它。

$content =  file_get_contents("http://www.imdb.com/movies-in-theaters/");
$dom = new DomDocument();
$dom->loadHTML($content);
$urls = $dom->getElementsByTagName('a');

此外，我对DomDocument了解不多。这将获取页面上的所有链接。然而，我只需要从这样的电影标题链接中获取电影的ID

http://www.imdb.com/title/tt1869716/

id为

tt1869716

Answer 1

function get_url_contents($url) {
    $crl = curl_init();
    curl_setopt($crl, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.1.4322)');
    curl_setopt($crl, CURLOPT_URL, $url);
    curl_setopt($crl, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($crl, CURLOPT_CONNECTTIMEOUT, 5);
    $ret = curl_exec($crl);
    curl_close($crl);
    return $ret;
}
function getElementsByClassName(DOMDocument $DOMDocument, $ClassName)
{
    $Elements = $DOMDocument -> getElementsByTagName("*");
    $Matched = array();
    foreach($Elements as $node)
    {
        if( ! $node -> hasAttributes())
            continue;
        $classAttribute = $node -> attributes -> getNamedItem('class');
        if( ! $classAttribute)
            continue;
        $classes = explode(' ', $classAttribute -> nodeValue);
        if(in_array($ClassName, $classes))
            $Matched[] = $node;
    }
    return $Matched;
}
libxml_use_internal_errors(true);
$content =  get_url_contents("http://www.imdb.com/movies-in-theaters/"); 
$dom = new DomDocument();
$dom->loadHTML($content);
$elemsByClassName = getElementsByClassName($dom, 'overview-top'); 
foreach($elemsByClassName as $elem) {
    foreach ($elem->getElementsByTagName('a') as $a) {
        preg_match('/(title/)([0-9A-Za-z]+)(/)?/',$a->getAttribute('href'), $matches);
        echo $a->nodeValue. ' - ' . $matches[2] . '<br/>';
        break; // we need only the first A tag.
    }
}

输出：

 Star Trek Into Darkness (2013) - tt1408101
 Frances Ha (2012) - tt2347569
 Stories We Tell (2012) - tt2366450
 The Expatriate (2012) - tt1645155
 The English Teacher (2013) - tt2055765
 Augustine (2012) - tt2098628
 Black Rock (2012) - tt1930294
 State 194 (2012) - tt2324918
 Iron Man 3 (2013) - tt1300854
 The Great Gatsby (2013) - tt1343092
 Pain & Gain (2013) - tt1980209
 Peeples (2013) - tt1699755
 42 (2013) - tt0453562
 Oblivion (2013) - tt1483013
 The Croods (2013) - tt0481499
 The Big Wedding (2013) - tt1931435
 Mud (2012) - tt1935179
 Oz the Great and Powerful (2013) - tt1623205